What causes "An error occurred during file deletion." in danny-avila/LibreChat?

Inspect the logAxiosError output emitted just before the throw — it captures lastError details even when .message is empty.

danny-avila/LibreChat · error

An error occurred during file deletion.

Error message

An error occurred during file deletion.

What it means

Thrown by the Code environment file-deletion path (Code/crud.js) when a deletion attempt left a lastError whose own message is empty, used as a fallback so the caller still receives a non-empty error string. A 404 is explicitly swallowed (returns early) before this line.

Source

Thrown at api/server/services/Files/Code/crud.js:122

        lastError = error;
        if (!missingOrUnsupportedStatuses.has(error.response?.status)) {
          throw error;
        }
      }
    }
  } catch (error) {
    lastError = error;
  }

  if (lastError) {
    logAxiosError({
      error: lastError,
      message: `Error deleting code environment file: ${lastError.message}`,
    });
    if (lastError.response?.status === 404) {
      return;
    }
    throw new Error(lastError.message || 'An error occurred during file deletion.');
  }
}

/**
 * Uploads a file to the Code Environment server.
 *
 * `kind`/`id`/`version?` are required so codeapi can route the upload to
 * the correct sessionKey bucket — `<tenant>:<kind>:<id>[:v:<version>]`
 * for shared kinds, `<tenant>:user:<authContext.userId>` for `user`.
 * Without these, codeapi falls back to user-scoped bucketing regardless
 * of the resource the file belongs to, so skill-cache invalidation
 * (driven by the version bump on edit) never fires. See codeapi #1455.
 *
 * @param {Object} params - The params object.
 * @param {ServerRequest} params.req - The request object from Express. It should have a `user` property with an `id` representing the user
 * @param {import('fs').ReadStream | import('stream').Readable} params.stream - The read stream for the file.
 * @param {string} params.filename - The name of the file.
 * @param {'skill' | 'agent' | 'user'} params.kind - Resource kind that owns this file's storage session.

View on GitHub (pinned to 5ff282f900)

Solutions

Inspect the logAxiosError output emitted just before the throw — it captures lastError details even when .message is empty.
Reproduce with verbose code-server logging to capture the underlying status/response.
Treat a confirmed 404 as already-deleted and short-circuit earlier if the file is known to be gone.
Verify the code server is healthy and the delete endpoint is reachable.

Example fix

// before
throw new Error(lastError.message || 'An error occurred during file deletion.');

// after
const detail = lastError.response?.status
  ? `code ${lastError.response.status}`
  : lastError.code || lastError.message;
throw new Error(`Code env file deletion failed (${detail})`);

Defensive patterns

Strategy: try-catch

Try / catch

try {
  await deleteCodeEnvFile(params);
} catch (err) {
  if (/An error occurred during file deletion/.test(err.message)) {
    logger.error('Delete produced empty error message', { lastError });
    return res.status(502).json({ message: 'Code server returned an unspecified deletion error' });
  }
  throw err;
}

Prevention

Capture lastError details (status, code, response) in logs since the message may be empty.
Short-circuit on confirmed 404 before reaching the fallback throw.
Monitor the code server health so empty-message errors are rare.

When it happens

Trigger: The code server returned a non-404 failure with an empty or undefined error.message — e.g. a connection reset with no message, or an unexpected response shape where lastError exists but carries no message.

Common situations: Code server crashed mid-request leaving an error object without a message; axios produced an error whose message was stripped by an interceptor; the delete attempt hit a 500 with an empty body.

Related errors

AI-assisted analysis of danny-avila/LibreChat@5ff282f900 (2026-08-12). Data as JSON: /api/errors/208973becb0a6753. Report an issue: GitHub.