Because the error is on the homepage, I had to give the page with the error another name. Its now http://www.zorgfilosofie.nl/index_error_contribute.html
Please can someone or a professional help. If neccesary I can send an contribute connectionkey (only in private mail).
Thanks a lot!
The Administrate the website select the Role and choose the appropriate line spacing toavoid this problem, please read the details in the blog - http://blogs.adobe.com/contribute/2010/06/paragraph_spacing_options_in_a.html