JSON Syntax Error: Method Not Allowed (405) - Troubleshooting Guide

The error message indicates that there was a JSON syntax error in the response received from the server. Instead of a valid JSON response, the server returned an HTML error page with the message 'Whitelabel Error Page'. This typically occurs when there is an issue with the server-side code or configuration.

In this specific case, the error message suggests that a POST request was made to a resource that does not support the POST method. The server responded with a 'Method Not Allowed' error (status code 405) and provided the HTML error page as a fallback.

To resolve this issue, you should review the server-side code and configuration to ensure that the requested resource supports the POST method and is correctly configured to handle the request.