on www.taverne-hemelrijk.com/test.html  the webform gives a PHP 500 error.

On www.compudata.info/contact.html it is working fine.

Both are create with website X5 v13 and are on the same server, just another subfolder. 

The server has 5 websites only this partticular one does not want to send webforms.

Both use standard script and POST.

I don't know what goes wrong. What file can I change or where do I have to look. In X5 I did not faound the difference.

I migrated for testing the websites to another server and get the same result. One is working the other one not