Comment-problem, strange error page

I seem to have trouble getting comments to my posts.

Here is my blog.. Press “ingen kommentarer” to try and comment. If anyone of you have any idea what causes this please reply.
I’ve never had this problem before. It must have emerged just recently. My theme is based on “Connections” (largely customized). The comments.php-file has only been translated to norwegian, no other adjustments were made.