Button in Tinymce not working

Just installed Bol. partner program… when I try to paste A ProductLink in a Page/Post the categorie lists isn’t loading.

Tiny mce could not respond. This could by due server error 500, but reading and testing other sollutions wasnt helpfull… does anyone know the fix for this problem?

Site: 101pelgrims.nl

http://wordpress.org/extend/plugins/bolcom-partnerprogramma-wordpress-plugin/