diff --git a/src/frontend/apps/drive/src/features/api/APIError.ts b/src/frontend/apps/drive/src/features/api/APIError.ts
index e93dcda6..24fb6f5e 100644
--- a/src/frontend/apps/drive/src/features/api/APIError.ts
+++ b/src/frontend/apps/drive/src/features/api/APIError.ts
@@ -1,5 +1,6 @@
 /* eslint-disable @typescript-eslint/no-explicit-any */
 import i18n from "@/features/i18n/initI18n";
+import { AppError } from "../errors/AppError";
 
 export class APIError extends Error {
   data?: any;
@@ -19,25 +20,24 @@ export const errorToString = (error: unknown): string => {
   if (error instanceof APIError) {
     // If there is a data, it means that the error is a JSON object
     if (error.data) {
-      return errorToString(error.data);
+      /**
+       * This is made to handle full text errors from the API like:
+       *
+       * "title": [
+       *   "The title field is required."
+       *  ]
+       */
+      return Object.entries(error.data)
+        .map(([, value]) => `${value}`)
+        .join("\n");
     }
     // If there is no data, it means that the error is a string, probably a complicated html error.
     return i18n.t("api.error.unexpected");
   }
-  if (error instanceof Error) {
+  // We want to show the error message from the AppError only. Not message from the Error class as they
+  // can be really technical and not helpful for the user. For those we show the generic error message.
+  if (error instanceof AppError) {
     return error.message;
   }
-  if (typeof error === "object" && error !== null) {
-    /**
-     * This is made to handle full text errors from the API like:
-     *
-     * "title": [
-     *   "The title field is required."
-     *  ]
-     */
-    return Object.entries(error)
-      .map(([, value]) => `${errorToString(value)}`)
-      .join("\n");
-  }
   return i18n.t("api.error.unexpected");
 };
diff --git a/src/frontend/apps/drive/src/features/errors/AppError.ts b/src/frontend/apps/drive/src/features/errors/AppError.ts
new file mode 100644
index 00000000..56ee6854
--- /dev/null
+++ b/src/frontend/apps/drive/src/features/errors/AppError.ts
@@ -0,0 +1 @@
+export class AppError extends Error {}