diff --git a/src/AnonymizedFile.ts b/src/AnonymizedFile.ts
index aa9cdc2..454a148 100644
--- a/src/AnonymizedFile.ts
+++ b/src/AnonymizedFile.ts
@@ -43,7 +43,10 @@ export default class AnonymizedFile {
   constructor(data: { repository: Repository; anonymizedPath: string }) {
     this.repository = data.repository;
     if (!this.repository.options.terms)
-      throw new AnonymousError("terms_not_specified");
+      throw new AnonymousError("terms_not_specified", {
+        object: this,
+        httpStatus: 400,
+      });
     this.anonymizedPath = data.anonymizedPath;
   }
 
@@ -54,7 +57,11 @@ export default class AnonymizedFile {
    */
   async originalPath(): Promise<string> {
     if (this._originalPath) return this._originalPath;
-    if (!this.anonymizedPath) throw new AnonymousError("path_not_specified");
+    if (!this.anonymizedPath)
+      throw new AnonymousError("path_not_specified", {
+        object: this,
+        httpStatus: 400,
+      });
 
     const paths = this.anonymizedPath.trim().split("/");
 
@@ -70,7 +77,10 @@ export default class AnonymizedFile {
         continue;
       }
       if (!currentAnonymized[fileName]) {
-        throw new AnonymousError("file_not_found", this);
+        throw new AnonymousError("file_not_found", {
+          object: this,
+          httpStatus: 404,
+        });
       }
       currentAnonymized = currentAnonymized[fileName];
 
@@ -103,7 +113,7 @@ export default class AnonymizedFile {
       currentAnonymized.sha === undefined ||
       currentAnonymized.size === undefined
     ) {
-      throw new AnonymousError("folder_not_supported", this);
+      throw new AnonymousError("folder_not_supported", { object: this });
     }
 
     const file: TreeFile = currentAnonymized as TreeFile;
@@ -114,7 +124,10 @@ export default class AnonymizedFile {
       // it should never happen
       const shaTree = tree2sha(currentOriginal);
       if (!currentAnonymized.sha || !shaTree[file.sha]) {
-        throw new AnonymousError("file_not_found", this);
+        throw new AnonymousError("file_not_found", {
+          object: this,
+          httpStatus: 404,
+        });
       }
 
       this._originalPath = path.join(currentOriginalPath, shaTree[file.sha]);
@@ -147,7 +160,10 @@ export default class AnonymizedFile {
 
   async content(): Promise<stream.Readable> {
     if (this.fileSize && this.fileSize > config.MAX_FILE_SIZE) {
-      throw new AnonymousError("file_too_big", this);
+      throw new AnonymousError("file_too_big", {
+        object: this,
+        httpStatus: 403,
+      });
     }
     if (await storage.exists(this.originalCachePath)) {
       return storage.read(this.originalCachePath);
@@ -163,7 +179,11 @@ export default class AnonymizedFile {
   }
 
   get originalCachePath() {
-    if (!this.originalPath) throw new AnonymousError("path_not_defined");
+    if (!this.originalPath)
+      throw new AnonymousError("path_not_defined", {
+        object: this,
+        httpStatus: 400,
+      });
     return path.join(this.repository.originalCachePath, this._originalPath);
   }
 
diff --git a/src/AnonymousError.ts b/src/AnonymousError.ts
index 51bba96..09cf7ad 100644
--- a/src/AnonymousError.ts
+++ b/src/AnonymousError.ts
@@ -1,18 +1,53 @@
-import { CustomError } from 'ts-custom-error'
+import { CustomError } from "ts-custom-error";
+import AnonymizedFile from "./AnonymizedFile";
+import Repository from "./Repository";
+import GitHubBase from "./source/GitHubBase";
+import { GitHubRepository } from "./source/GitHubRepository";
+import User from "./User";
 
 /**
  * Custom error message
  */
 export default class AnonymousError extends CustomError {
-  
-  value: any;
+  value?: any;
+  httpStatus?: number;
+  cause?: Error;
 
-  constructor(message: string, value?: any) {
+  constructor(
+    message: string,
+    opt?: {
+      httpStatus?: number;
+      cause?: Error;
+      object?: any;
+    }
+  ) {
     super(message);
-    this.value = value;
+    this.value = opt?.object;
+    this.httpStatus = opt?.httpStatus;
+    this.cause = opt?.cause;
   }
 
   toString(): string {
-    return this.message;
+    let out = "";
+    let detail = this.value ? JSON.stringify(this.value) : null;
+    if (this.value instanceof Repository) {
+      detail = this.value.repoId;
+    } else if (this.value instanceof AnonymizedFile) {
+      detail = `/r/${this.value.repository.repoId}/${this.value.anonymizedPath}`;
+    } else if (this.value instanceof GitHubRepository) {
+      detail = `${this.value.fullName}`;
+    } else if (this.value instanceof User) {
+      detail = `${this.value.username}`;
+    } else if (this.value instanceof GitHubBase) {
+      detail = `${this.value.repository.repoId}`;
+    }
+    out += this.message;
+    if (detail) {
+      out += `: ${detail}`;
+    }
+    if (this.cause) {
+      out += `\n\tCause by ${this.cause}\n${this.cause.stack}`;
+    }
+    return out;
   }
 }
diff --git a/src/Repository.ts b/src/Repository.ts
index f6ffaa4..4663507 100644
--- a/src/Repository.ts
+++ b/src/Repository.ts
@@ -34,7 +34,10 @@ export default class Repository {
         this.source = new Zip(data.source, this);
         break;
       default:
-        throw new AnonymousError("unsupported_source", data.source.type);
+        throw new AnonymousError("unsupported_source", {
+          object: data.source.type,
+          httpStatus: 400,
+        });
     }
     this.owner = new User(new UserModel({ _id: data.owner }));
   }
@@ -110,7 +113,10 @@ export default class Repository {
       this.status == "removing" ||
       this.status == "removed"
     ) {
-      throw new AnonymousError("repository_expired", this);
+      throw new AnonymousError("repository_expired", {
+        object: this,
+        httpStatus: 410,
+      });
     }
     const fiveMinuteAgo = new Date();
     fiveMinuteAgo.setMinutes(fiveMinuteAgo.getMinutes() - 5);
@@ -119,7 +125,9 @@ export default class Repository {
       this.status == "preparing" ||
       (this.status == "download" && this._model.statusDate > fiveMinuteAgo)
     ) {
-      throw new AnonymousError("repository_not_ready", this);
+      throw new AnonymousError("repository_not_ready", {
+        object: this,
+      });
     }
   }
 
@@ -170,7 +178,9 @@ export default class Repository {
           );
           await this.updateStatus("error", "branch_not_found");
           await this.resetSate();
-          throw new AnonymousError("branch_not_found", this);
+          throw new AnonymousError("branch_not_found", {
+            object: this,
+          });
         }
         this._model.anonymizeDate = new Date();
         console.log(`${this._model.repoId} will be updated to ${newCommit}`);
@@ -234,8 +244,9 @@ export default class Repository {
   /**
    * Reset/delete the state of the repository
    */
-  async resetSate(status?: RepositoryStatus) {
+  async resetSate(status?: RepositoryStatus, statusMessage?: string) {
     if (status) this._model.status = status;
+    if (statusMessage) this._model.statusMessage = statusMessage;
     // remove attribute
     this._model.size = { storage: 0, file: 0 };
     this._model.originalFiles = null;
diff --git a/src/database/database.ts b/src/database/database.ts
index fa5da49..8088378 100644
--- a/src/database/database.ts
+++ b/src/database/database.ts
@@ -24,6 +24,10 @@ export async function connect() {
 
 export async function getRepository(repoId: string) {
   const data = await AnonymizedRepositoryModel.findOne({ repoId });
-  if (!data) throw new AnonymousError("repo_not_found", repoId);
+  if (!data)
+    throw new AnonymousError("repo_not_found", {
+      object: repoId,
+      httpStatus: 400,
+    });
   return new Repository(data);
 }
diff --git a/src/queue.ts b/src/queue.ts
index 0185d73..586a87d 100644
--- a/src/queue.ts
+++ b/src/queue.ts
@@ -1,5 +1,6 @@
 import * as Queue from "bull";
 import config from "../config";
+import AnonymousError from "./AnonymousError";
 import { getRepository } from "./database/database";
 import Repository from "./Repository";
 
@@ -28,7 +29,15 @@ removeQueue.process(5, async (job) => {
     const repo = await getRepository(job.data.repoId);
     await repo.remove();
   } catch (error) {
-    console.log("error", error);
+    if (error instanceof AnonymousError) {
+      console.error(
+        "[ERROR]",
+        error.toString(),
+        error.stack.split("\n")[1].trim()
+      );
+    } else {
+      console.error(error);
+    }
   } finally {
     console.log(`${job.data.repoId} is removed`);
   }
@@ -43,7 +52,15 @@ downloadQueue.process(2, async (job) => {
     job.progress("resetSate");
     await repo.anonymize();
   } catch (error) {
-    console.log("error", error);
+    if (error instanceof AnonymousError) {
+      console.error(
+        "[ERROR]",
+        error.toString(),
+        error.stack.split("\n")[1].trim()
+      );
+    } else {
+      console.error(error);
+    }
   } finally {
     console.log(`${job.data.repoId} is downloaded`);
   }
diff --git a/src/routes/conference.ts b/src/routes/conference.ts
index 3b5fc16..02b1dfd 100644
--- a/src/routes/conference.ts
+++ b/src/routes/conference.ts
@@ -67,26 +67,79 @@ router.get("/", async (req: express.Request, res: express.Response) => {
 });
 
 function validateConferenceForm(conf) {
-  if (!conf.name) throw new AnonymousError("conf_name_missing");
-  if (!conf.conferenceID) throw new AnonymousError("conf_id_missing");
-  if (!conf.startDate) throw new AnonymousError("conf_start_date_missing");
-  if (!conf.endDate) throw new AnonymousError("conf_end_date_missing");
+  if (!conf.name)
+    throw new AnonymousError("conf_name_missing", {
+      object: conf,
+      httpStatus: 400,
+    });
+  if (!conf.conferenceID)
+    throw new AnonymousError("conf_id_missing", {
+      object: conf,
+      httpStatus: 400,
+    });
+  if (!conf.startDate)
+    throw new AnonymousError("conf_start_date_missing", {
+      object: conf,
+      httpStatus: 400,
+    });
+  if (!conf.endDate)
+    throw new AnonymousError("conf_end_date_missing", {
+      object: conf,
+      httpStatus: 400,
+    });
   if (new Date(conf.startDate) > new Date(conf.endDate))
-    throw new AnonymousError("conf_start_date_invalid");
+    throw new AnonymousError("conf_start_date_invalid", {
+      object: conf,
+      httpStatus: 400,
+    });
   if (new Date() > new Date(conf.endDate))
-    throw new AnonymousError("conf_end_date_invalid");
+    throw new AnonymousError("conf_end_date_invalid", {
+      object: conf,
+      httpStatus: 400,
+    });
   if (plans.filter((p) => p.id == conf.plan.planID).length != 1)
-    throw new AnonymousError("invalid_plan");
+    throw new AnonymousError("invalid_plan", {
+      object: conf,
+      httpStatus: 400,
+    });
   const plan = plans.filter((p) => p.id == conf.plan.planID)[0];
   if (plan.pricePerRepo > 0) {
     const billing = conf.billing;
-    if (!billing) throw new AnonymousError("billing_missing");
-    if (!billing.name) throw new AnonymousError("billing_name_missing");
-    if (!billing.email) throw new AnonymousError("billing_email_missing");
-    if (!billing.address) throw new AnonymousError("billing_address_missing");
-    if (!billing.city) throw new AnonymousError("billing_city_missing");
-    if (!billing.zip) throw new AnonymousError("billing_zip_missing");
-    if (!billing.country) throw new AnonymousError("billing_country_missing");
+    if (!billing)
+      throw new AnonymousError("billing_missing", {
+        object: conf,
+        httpStatus: 400,
+      });
+    if (!billing.name)
+      throw new AnonymousError("billing_name_missing", {
+        object: conf,
+        httpStatus: 400,
+      });
+    if (!billing.email)
+      throw new AnonymousError("billing_email_missing", {
+        object: conf,
+        httpStatus: 400,
+      });
+    if (!billing.address)
+      throw new AnonymousError("billing_address_missing", {
+        object: conf,
+        httpStatus: 400,
+      });
+    if (!billing.city)
+      throw new AnonymousError("billing_city_missing", {
+        object: conf,
+        httpStatus: 400,
+      });
+    if (!billing.zip)
+      throw new AnonymousError("billing_zip_missing", {
+        object: conf,
+        httpStatus: 400,
+      });
+    if (!billing.country)
+      throw new AnonymousError("billing_country_missing", {
+        object: conf,
+        httpStatus: 400,
+      });
   }
 }
 
@@ -101,7 +154,10 @@ router.post(
           conferenceID: req.params.conferenceID,
         });
         if (model.owners.indexOf(user.model.id) == -1)
-          throw new AnonymousError("not_authorized");
+          throw new AnonymousError("not_authorized", {
+            object: req.params.conferenceID,
+            httpStatus: 401,
+          });
       }
       validateConferenceForm(req.body);
       model.name = req.body.name;
@@ -146,7 +202,13 @@ router.post(
       res.send("ok");
     } catch (error) {
       if (error.message?.indexOf(" duplicate key") > -1) {
-        return handleError(new AnonymousError("conf_id_used"), res);
+        return handleError(
+          new AnonymousError("conf_id_used", {
+            object: req.params.conferenceID,
+            httpStatus: 400,
+          }),
+          res
+        );
       }
       handleError(error, res);
     }
@@ -161,10 +223,17 @@ router.get(
       const data = await ConferenceModel.findOne({
         conferenceID: req.params.conferenceID,
       });
-      if (!data) throw new AnonymousError("conf_not_found");
+      if (!data)
+        throw new AnonymousError("conf_not_found", {
+          object: req.params.conferenceID,
+          httpStatus: 404,
+        });
       const conference = new Conference(data);
       if (conference.ownerIDs.indexOf(user.model.id) == -1)
-        throw new AnonymousError("not_authorized");
+        throw new AnonymousError("not_authorized", {
+          object: req.params.conferenceID,
+          httpStatus: 401,
+        });
       const o: any = conference.toJSON();
       o.repositories = (await conference.repositories()).map((r) => r.toJSON());
       res.json(o);
@@ -182,10 +251,17 @@ router.delete(
       const data = await ConferenceModel.findOne({
         conferenceID: req.params.conferenceID,
       });
-      if (!data) throw new AnonymousError("conf_not_found");
+      if (!data)
+        throw new AnonymousError("conf_not_found", {
+          object: req.params.conferenceID,
+          httpStatus: 400,
+        });
       const conference = new Conference(data);
       if (conference.ownerIDs.indexOf(user.model.id) == -1)
-        throw new AnonymousError("not_authorized");
+        throw new AnonymousError("not_authorized", {
+          object: req.params.conferenceID,
+          httpStatus: 401,
+        });
       await conference.remove();
       res.send("ok");
     } catch (error) {
diff --git a/src/routes/file.ts b/src/routes/file.ts
index ed63eb4..41e2df3 100644
--- a/src/routes/file.ts
+++ b/src/routes/file.ts
@@ -1,5 +1,6 @@
 import * as express from "express";
 import AnonymizedFile from "../AnonymizedFile";
+import AnonymousError from "../AnonymousError";
 import { getRepo, handleError } from "./route-utils";
 
 export const router = express.Router();
@@ -24,7 +25,10 @@ router.get(
         anonymizedPath,
       });
       if (!(await f.isFileSupported())) {
-        return res.status(500).send({ error: "file_not_supported" });
+        throw new AnonymousError("file_not_supported", {
+          httpStatus: 403,
+          object: f,
+        });
       }
       res.attachment(
         anonymizedPath.substring(anonymizedPath.lastIndexOf("/") + 1)
diff --git a/src/routes/repository-private.ts b/src/routes/repository-private.ts
index 8cb5f85..365b2b1 100644
--- a/src/routes/repository-private.ts
+++ b/src/routes/repository-private.ts
@@ -24,15 +24,24 @@ router.post("/claim", async (req: express.Request, res: express.Response) => {
   const user = await getUser(req);
   try {
     if (!req.body.repoId) {
-      return res.status(500).json({ error: "repoId_not_defined" });
+      throw new AnonymousError("repoId_not_defined", {
+        object: req.body,
+        httpStatus: 400,
+      });
     }
     if (!req.body.repoUrl) {
-      return res.status(500).json({ error: "repoUrl_not_defined" });
+      throw new AnonymousError("repoUrl_not_defined", {
+        object: req.body,
+        httpStatus: 400,
+      });
     }
 
     const repoConfig = await db.getRepository(req.body.repoId);
     if (repoConfig == null) {
-      return res.status(500).json({ error: "repo_not_found" });
+      throw new AnonymousError("repo_not_found", {
+        object: req.body,
+        httpStatus: 404,
+      });
     }
 
     const r = gh(req.body.repoUrl);
@@ -42,7 +51,10 @@ router.post("/claim", async (req: express.Request, res: express.Response) => {
       accessToken: user.accessToken,
     });
     if ((repoConfig.source as GitHubBase).githubRepository.id != repo.id) {
-      return res.status(500).json({ error: "repo_not_found" });
+      throw new AnonymousError("repo_not_found", {
+        object: req.body,
+        httpStatus: 404,
+      });
     }
 
     console.log(`${user.username} claims ${r.repository}.`);
@@ -70,7 +82,10 @@ router.post(
 
       const user = await getUser(req);
       if (repo.owner.id != user.id) {
-        return res.status(401).json({ error: "not_authorized" });
+        throw new AnonymousError("not_authorized", {
+          object: req.params.repoId,
+          httpStatus: 401,
+        });
       }
       await repo.updateIfNeeded({ force: true });
       res.json({ status: repo.status });
@@ -88,10 +103,17 @@ router.delete(
     if (!repo) return;
     // if (repo.status == "removing") return res.json({ status: repo.status });
     try {
-      if (repo.status == "removed") throw new AnonymousError("is_removed");
+      if (repo.status == "removed")
+        throw new AnonymousError("is_removed", {
+          object: req.params.repoId,
+          httpStatus: 410,
+        });
       const user = await getUser(req);
       if (repo.owner.id != user.id) {
-        return res.status(401).json({ error: "not_authorized" });
+        throw new AnonymousError("not_authorized", {
+          object: req.params.repoId,
+          httpStatus: 401,
+        });
       }
       await repo.updateStatus("removing");
       await removeQueue.add(repo, { jobId: repo.repoId });
@@ -152,7 +174,12 @@ router.get(
         repo: req.params.repo,
         accessToken: user.accessToken,
       });
-      if (!repo) return res.status(404).send({ error: "repo_not_found" });
+      if (!repo) {
+        throw new AnonymousError("repo_not_found", {
+          object: req.params.repoId,
+          httpStatus: 404,
+        });
+      }
       return res.send(
         await repo.readme({
           accessToken: user.accessToken,
@@ -174,7 +201,10 @@ router.get("/:repoId/", async (req: express.Request, res: express.Response) => {
 
     const user = await getUser(req);
     if (repo.owner.id != user.id) {
-      return res.status(401).send({ error: "not_authorized" });
+      throw new AnonymousError("not_authorized", {
+        object: req.params.repoId,
+        httpStatus: 401,
+      });
     }
     res.json((await db.getRepository(req.params.repoId)).toJSON());
   } catch (error) {
@@ -188,22 +218,40 @@ function validateNewRepo(repoUpdate) {
     !repoUpdate.repoId.match(validCharacters) ||
     repoUpdate.repoId.length < 3
   ) {
-    throw new AnonymousError("invalid_repoId", repoUpdate.repoId);
+    throw new AnonymousError("invalid_repoId", {
+      object: repoUpdate,
+      httpStatus: 400,
+    });
   }
   if (!repoUpdate.source.branch) {
-    throw new AnonymousError("branch_not_specified");
+    throw new AnonymousError("branch_not_specified", {
+      object: repoUpdate,
+      httpStatus: 400,
+    });
   }
   if (!repoUpdate.source.commit) {
-    throw new AnonymousError("commit_not_specified");
+    throw new AnonymousError("commit_not_specified", {
+      object: repoUpdate,
+      httpStatus: 400,
+    });
   }
   if (!repoUpdate.options) {
-    throw new AnonymousError("options_not_provided");
+    throw new AnonymousError("options_not_provided", {
+      object: repoUpdate,
+      httpStatus: 400,
+    });
   }
   if (!Array.isArray(repoUpdate.terms)) {
-    throw new AnonymousError("invalid_terms_format", repoUpdate.terms);
+    throw new AnonymousError("invalid_terms_format", {
+      object: repoUpdate,
+      httpStatus: 400,
+    });
   }
   if (!/^[a-fA-F0-9]+$/.test(repoUpdate.source.commit)) {
-    throw new AnonymousError("invalid_commit_format", repoUpdate.source.commit);
+    throw new AnonymousError("invalid_commit_format", {
+      object: repoUpdate,
+      httpStatus: 400,
+    });
   }
 }
 
@@ -248,7 +296,10 @@ router.post(
       const user = await getUser(req);
 
       if (repo.owner.id != user.id) {
-        return res.status(401).json({ error: "not_authorized" });
+        throw new AnonymousError("not_authorized", {
+          object: req.params.repoId,
+          httpStatus: 401,
+        });
       }
 
       const repoUpdate = req.body;
@@ -289,7 +340,10 @@ router.post(
             new Date() > conf.endDate ||
             conf.status !== "ready"
           ) {
-            throw new AnonymousError("conf_not_activated");
+            throw new AnonymousError("conf_not_activated", {
+              object: conf,
+              httpStatus: 400,
+            });
           }
           const f = conf.repositories.filter((r) => r.id == repo.model.id);
           if (f.length) {
@@ -346,7 +400,10 @@ router.post("/", async (req: express.Request, res: express.Response) => {
     if (repo.source.type == "GitHubDownload") {
       // details.size is in kilobytes
       if (repository.size > config.MAX_REPO_SIZE) {
-        return res.status(500).send({ error: "invalid_mode" });
+        throw new AnonymousError("invalid_mode", {
+          object: repository,
+          httpStatus: 400,
+        });
       }
     }
     repo.conference = repoUpdate.conference;
@@ -364,7 +421,10 @@ router.post("/", async (req: express.Request, res: express.Response) => {
           conf.status !== "ready"
         ) {
           await repo.remove();
-          throw new AnonymousError("conf_not_activated");
+          throw new AnonymousError("conf_not_activated", {
+            object: conf,
+            httpStatus: 400,
+          });
         }
         conf.repositories.push({
           id: repo.id,
@@ -379,7 +439,11 @@ router.post("/", async (req: express.Request, res: express.Response) => {
   } catch (error) {
     if (error.message?.indexOf(" duplicate key") > -1) {
       return handleError(
-        new AnonymousError("repoId_already_used", repoUpdate.repoId),
+        new AnonymousError("repoId_already_used", {
+          httpStatus: 400,
+          cause: error,
+          object: repoUpdate,
+        }),
         res
       );
     }
diff --git a/src/routes/repository-public.ts b/src/routes/repository-public.ts
index 87e33d9..39396be 100644
--- a/src/routes/repository-public.ts
+++ b/src/routes/repository-public.ts
@@ -12,14 +12,25 @@ const router = express.Router();
 router.get(
   "/:repoId/zip",
   async (req: express.Request, res: express.Response) => {
-    if (!config.ENABLE_DOWNLOAD)
-      return res.status(403).send({ error: "download_not_enabled" });
-    const repo = await getRepo(req, res);
-    if (!repo) return;
-
     const pipeline = promisify(stream.pipeline);
 
     try {
+      if (!config.ENABLE_DOWNLOAD) {
+        throw new AnonymousError("download_not_enabled", {
+          httpStatus: 403,
+          object: req.params.repoId,
+        });
+      }
+      const repo = await getRepo(req, res);
+      if (!repo) return;
+
+      if (repo.source.type != "GitHubDownload") {
+        throw new AnonymousError("download_not_enabled", {
+          httpStatus: 403,
+          object: req.params.repoId,
+        });
+      }
+
       res.attachment(`${repo.repoId}.zip`);
 
       // cache the file for 6 hours
@@ -67,7 +78,10 @@ router.get(
           repo.status == "removing" ||
           repo.status == "removed"
         ) {
-          throw new AnonymousError("repository_expired", repo);
+          throw new AnonymousError("repository_expired", {
+            object: repo,
+            httpStatus: 410,
+          });
         }
 
         const fiveMinuteAgo = new Date();
@@ -85,10 +99,16 @@ router.get(
               repo.model.statusMessage
                 ? repo.model.statusMessage
                 : "repository_not_available",
-              repo
+              {
+                object: repo,
+                httpStatus: 500,
+              }
             );
           }
-          throw new AnonymousError("repository_not_ready", repo);
+          throw new AnonymousError("repository_not_ready", {
+            httpStatus: 404,
+            object: repo,
+          });
         }
 
         await repo.updateIfNeeded();
diff --git a/src/routes/route-utils.ts b/src/routes/route-utils.ts
index 683ec1e..1a5cb87 100644
--- a/src/routes/route-utils.ts
+++ b/src/routes/route-utils.ts
@@ -38,24 +38,11 @@ export async function getRepo(
 }
 
 function printError(error: any) {
+  io.notifyError(error, error.value);
   if (error instanceof AnonymousError) {
-    io.notifyError(error, error.value);
-    let detail = error.value ? JSON.stringify(error.value) : null;
-    if (error.value instanceof Repository) {
-      detail = error.value.repoId;
-    } else if (error.value instanceof AnonymizedFile) {
-      detail = `/r/${error.value.repository.repoId}/${error.value.anonymizedPath}`;
-    } else if (error.value instanceof GitHubRepository) {
-      detail = `${error.value.fullName}`;
-    } else if (error.value instanceof User) {
-      detail = `${error.value.username}`;
-    } else if (error.value instanceof GitHubBase) {
-      detail = `${error.value.repository.repoId}`;
-    }
     console.error(
       "[ERROR]",
-      error.message,
-      detail ? `'${detail}'` : null,
+      error.toString(),
       error.stack.split("\n")[1].trim()
     );
   } else if (error instanceof Error) {
@@ -72,7 +59,9 @@ export function handleError(error: any, res: express.Response) {
     message = error.message;
   }
   let status = 500;
-  if (message && message.indexOf("not_found") > -1) {
+  if (error.httpStatus) {
+    status = error.httpStatus;
+  } else if (message && message.indexOf("not_found") > -1) {
     status = 400;
   } else if (message && message.indexOf("not_connected") > -1) {
     status = 401;
@@ -86,12 +75,16 @@ export async function getUser(req: express.Request) {
   const user = (req.user as any).user;
   if (!user) {
     req.logout();
-    throw new AnonymousError("not_connected");
+    throw new AnonymousError("not_connected", {
+      httpStatus: 401,
+    });
   }
   const model = await UserModel.findById(user._id);
   if (!model) {
     req.logout();
-    throw new AnonymousError("not_connected");
+    throw new AnonymousError("not_connected", {
+      httpStatus: 401,
+    });
   }
   return new User(model);
 }
diff --git a/src/routes/webview.ts b/src/routes/webview.ts
index 025da86..a0b94aa 100644
--- a/src/routes/webview.ts
+++ b/src/routes/webview.ts
@@ -12,14 +12,20 @@ async function webView(req: express.Request, res: express.Response) {
   if (!repo) return;
   try {
     if (!repo.options.page || !repo.options.pageSource) {
-      throw new AnonymousError("page_not_activated");
+      throw new AnonymousError("page_not_activated", {
+        httpStatus: 400,
+        object: repo,
+      });
     }
 
     if (
       repo.options.pageSource?.branch !=
       (repo.source as GitHubDownload).branch.name
     ) {
-      throw new AnonymousError("page_not_supported_on_different_branch");
+      throw new AnonymousError("page_not_supported_on_different_branch", {
+        httpStatus: 400,
+        object: repo,
+      });
     }
 
     let requestPath = path.join(
@@ -37,7 +43,10 @@ async function webView(req: express.Request, res: express.Response) {
       anonymizedPath: requestPath,
     });
     if (!(await f.isFileSupported())) {
-      return res.status(500).send({ error: "file_not_supported" });
+      throw new AnonymousError("file_not_supported", {
+        httpStatus: 400,
+        object: f,
+      });
     }
     f.send(res);
   } catch (error) {
diff --git a/src/source/GitHubBase.ts b/src/source/GitHubBase.ts
index ae4bac1..25de2b7 100644
--- a/src/source/GitHubBase.ts
+++ b/src/source/GitHubBase.ts
@@ -38,11 +38,17 @@ export default abstract class GitHubBase {
   }
 
   async getFileContent(file: AnonymizedFile): Promise<stream.Readable> {
-    throw new AnonymousError("Method not implemented.");
+    throw new AnonymousError("method_not_implemented", {
+      httpStatus: 501,
+      object: this,
+    });
   }
-  
+
   getFiles(): Promise<Tree> {
-    throw new AnonymousError("Method not implemented.");
+    throw new AnonymousError("method_not_implemented", {
+      httpStatus: 501,
+      object: this,
+    });
   }
 
   async getToken(owner?: string) {
diff --git a/src/source/GitHubDownload.ts b/src/source/GitHubDownload.ts
index e2c38bf..b46d95f 100644
--- a/src/source/GitHubDownload.ts
+++ b/src/source/GitHubDownload.ts
@@ -45,7 +45,10 @@ export default class GitHubDownload extends GitHubBase implements SourceBase {
       this.repository.status == "download" &&
       this.repository.model.statusDate > fiveMinuteAgo
     )
-      throw new AnonymousError("repo_in_download", this.repository);
+      throw new AnonymousError("repo_in_download", {
+        httpStatus: 404,
+        object: this.repository,
+      });
     let response: OctokitResponse<unknown, number>;
     try {
       response = await this._getZipUrl(await this.getToken());
@@ -55,11 +58,19 @@ export default class GitHubDownload extends GitHubBase implements SourceBase {
           response = await this._getZipUrl(config.GITHUB_TOKEN);
         } catch (error) {
           await this.repository.resetSate("error");
-          throw new AnonymousError("repo_not_accessible", this.repository);
+          throw new AnonymousError("repo_not_accessible", {
+            httpStatus: 404,
+            cause: error,
+            object: this.repository,
+          });
         }
       } else {
         await this.repository.resetSate("error");
-        throw new AnonymousError("repo_not_accessible", this.repository);
+        throw new AnonymousError("repo_not_accessible", {
+          httpStatus: 404,
+          object: this.repository,
+          cause: error,
+        });
       }
     }
     await this.repository.updateStatus("download");
@@ -89,7 +100,11 @@ export default class GitHubDownload extends GitHubBase implements SourceBase {
       await storage.extractTar(originalPath, downloadStream);
     } catch (error) {
       await this.repository.updateStatus("error", "unable_to_download");
-      throw new AnonymousError("unable_to_download", error);
+      throw new AnonymousError("unable_to_download", {
+        httpStatus: 500,
+        cause: error,
+        object: this.repository,
+      });
     } finally {
       inDownload = false;
       clearTimeout(progressTimeout);
diff --git a/src/source/GitHubRepository.ts b/src/source/GitHubRepository.ts
index 44ba941..8085fc4 100644
--- a/src/source/GitHubRepository.ts
+++ b/src/source/GitHubRepository.ts
@@ -117,7 +117,11 @@ export class GitHubRepository {
         selected.readme = readme;
         await model.save();
       } catch (error) {
-        throw new AnonymousError("readme_not_available", this);
+        throw new AnonymousError("readme_not_available", {
+          httpStatus: 404,
+          cause: error,
+          object: this,
+        });
       }
     }
 
@@ -127,7 +131,10 @@ export class GitHubRepository {
   public get owner(): string {
     const repo = gh(this.fullName);
     if (!repo) {
-      throw new AnonymousError("invalid_repo", this);
+      throw new AnonymousError("invalid_repo", {
+        httpStatus: 400,
+        object: this,
+      });
     }
     return repo.owner || this.fullName;
   }
@@ -135,7 +142,10 @@ export class GitHubRepository {
   public get repo(): string {
     const repo = gh(this.fullName);
     if (!repo) {
-      throw new AnonymousError("invalid_repo", this);
+      throw new AnonymousError("invalid_repo", {
+        httpStatus: 400,
+        object: this,
+      });
     }
     return repo.name || this.fullName;
   }
@@ -159,18 +169,22 @@ export async function getRepositoryFromGitHub(opt: {
       })
     ).data;
   } catch (error) {
-    if (error.status == 404) {
-      throw new AnonymousError("repo_not_found", {
+    throw new AnonymousError("repo_not_found", {
+      httpStatus: error.status,
+      object: {
         owner: opt.owner,
         repo: opt.repo,
-      });
-    }
-    throw error;
+      },
+      cause: error,
+    });
   }
   if (!r)
     throw new AnonymousError("repo_not_found", {
-      owner: opt.owner,
-      repo: opt.repo,
+      httpStatus: 404,
+      object: {
+        owner: opt.owner,
+        repo: opt.repo,
+      },
     });
   let model = await RepositoryModel.findOne({ externalId: "gh_" + r.id });
   if (!model) {
diff --git a/src/source/GitHubStream.ts b/src/source/GitHubStream.ts
index 973bb53..e1223c4 100644
--- a/src/source/GitHubStream.ts
+++ b/src/source/GitHubStream.ts
@@ -25,7 +25,11 @@ export default class GitHubStream extends GitHubBase implements SourceBase {
   }
 
   async getFileContent(file: AnonymizedFile): Promise<stream.Readable> {
-    if (!file.sha) throw new AnonymousError("file_sha_not_provided", file);
+    if (!file.sha)
+      throw new AnonymousError("file_sha_not_provided", {
+        httpStatus: 400,
+        object: file,
+      });
     const octokit = new Octokit({
       auth: await this.getToken(),
     });
@@ -37,7 +41,10 @@ export default class GitHubStream extends GitHubBase implements SourceBase {
         file_sha: file.sha,
       });
       if (!ghRes.data.content && ghRes.data.size != 0) {
-        throw new AnonymousError("file_not_accessible", file);
+        throw new AnonymousError("file_not_accessible", {
+          httpStatus: 404,
+          object: file,
+        });
       }
       // empty file
       let content: Buffer;
@@ -54,12 +61,12 @@ export default class GitHubStream extends GitHubBase implements SourceBase {
       await storage.write(file.originalCachePath, content);
       return stream.Readable.from(content);
     } catch (error) {
-      if (error.status == 403) {
-        throw new AnonymousError("file_too_big", file);
-      }
-      console.error(error);
+      throw new AnonymousError("file_too_big", {
+        httpStatus: error.status,
+        cause: error,
+        object: file,
+      });
     }
-    throw new AnonymousError("file_not_accessible", file);
   }
 
   async getFiles() {
@@ -85,8 +92,16 @@ export default class GitHubStream extends GitHubBase implements SourceBase {
         recursive: "1",
       });
     } catch (error) {
-      await this.repository.resetSate("error");
-      throw new AnonymousError("repo_not_accessible", this.repository);
+      await this.repository.resetSate("error", "repo_not_accessible");
+      throw new AnonymousError("repo_not_accessible", {
+        httpStatus: error.status,
+        cause: error,
+        object: {
+          owner: this.githubRepository.owner,
+          repo: this.githubRepository.repo,
+          tree_sha: sha,
+        },
+      });
     }
 
     const tree = this.tree2Tree(ghRes.data.tree, truncatedTree, parentPath);
diff --git a/src/storage/S3.ts b/src/storage/S3.ts
index 270e85a..b712975 100644
--- a/src/storage/S3.ts
+++ b/src/storage/S3.ts
@@ -20,7 +20,10 @@ export default class S3Storage implements StorageBase {
   client: S3;
 
   constructor() {
-    if (!config.S3_BUCKET) throw new AnonymousError("s3_config_not_provided");
+    if (!config.S3_BUCKET)
+      throw new AnonymousError("s3_config_not_provided", {
+        httpStatus: 500,
+      });
     this.client = new S3({
       region: config.S3_REGION,
       endpoint: config.S3_ENDPOINT,
@@ -179,7 +182,7 @@ export default class S3Storage implements StorageBase {
       header.name = header.name.substr(header.name.indexOf("/") + 1);
       originalArchiveStreamToS3Entry.call(toS3, header, stream, next);
     };
-    
+
     return new Promise((resolve, reject) => {
       toS3 = new ArchiveStreamToS3(config.S3_BUCKET, p, this.client);
       stream