[SOLVED] WPML and Atahualpa

Hi,
my page: http://www.footyamsterdam.nl/
doesn't work anymore since a few days.
I use Atahualpa (with some small modifications I made) and WPML (the actual version).

The page works in my main language, but not in my other language anymore. The theme totally disappears. Has anyone a solution? I know there exists an Atahualpha/WPML plugin or theme. Is this necessary?

PS.: My page works with another theme perfect.