Error Message Example:

Intrusivo 70 http://site.com/wp-admin/admin-ajax.php Failed to load resource: the server responded with a status of 500 (Internal Server Error)

This error message tells us two key things:

The Server Responds with Status 500

• A 500 Internal Server Error means something went wrong on the server side.

• It could be due to misconfiguration, missing PHP extensions, server limits, or plugin conflicts.

• The best first step is to contact your hosting provider and ask them to check the server logs to identify the cause.

JS Error Points to admin-ajax.php

• The file wp-admin/admin-ajax.php is a WordPress core file used for AJAX requests.

• If it fails, the issue is not theme-related—it’s either a server configuration issue or a plugin issue.

• Since this is a WordPress core file, you can rule out your theme (as it works fine).

How to Fix the Issue

This specific problem is often caused by a missing PHP extension called php5-url.

To resolve it:

1. Contact your hosting provider and ask them to install/enable the php5-url extension.

2. Alternatively, you can refer to the solution detailed here:
   Plugin AJAX for All – 500 Internal Server Error Solution

This should resolve the issue and restore proper AJAX functionality.