The error message:

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 says two things:

a. server responds with status 500

Please contact hosting to confirm what that means.

b. JS error in wordpress files (wp-admin/admin-ajax) That is wordpress file and if wodpress errors show can be several causes (but it’s not theme for sure as for us everything works fine)

Solution:

This is related to the server configuration.

To solve it – install php5-url (original link with the solution) https://wordpress.org/support/topic/plugin-ajax-fo…

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Other issues related to 500 Server Error can be limited resources allocated for your account. If you get this error when you import demo see this help – http://help.wpresidence.net/2016/03/15/demo-content-fails/