Troubleshooting Suggest moving this topic to the intro chapter, this is burried here and not easily finadable. To assist with troubleshooting, append the following to the API query. Append ?debug=true for diagnostics. Append ?format=xml for XML formatted response on GETs. Common API Error Messages Error Code Error Message 204 No records found matching parameters. 400 Invalid parameter or value. 401 Unauthorized. 500 Internal Server Error. Parent topic: API Examples