Error in 'Contact'-link

My b2evolution Version: 3.3.3

I just moved my B2Evolution-install from one server to another.
Now my contactlink doesn't show the contactform anymore.

Everytime I click the contactlink on the frontpage, I get an 500-error.

The url of the site is: www.praktijksincere.nl.

Who can help me?

the second http:// in the contact form url causes that. contact your hosting provider and tell them about it

Here's the solution from my provider:

Make a file with the name .htaccess with this code:

SecFilterEngine Off
SecFilterScanPOST Off

Than put it in the http(docs)-directory of your server.

Thanks to all.

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