After hours of searching I have no clue how to solve the problem

I created a CV with the modernCV template in LYX(2.0)(Miktex 2.9). I used the classic version. Creating a PDF, was no Problem, without any errors. Then I wanted to change from classic to casual and the problems began. I got an error message about a missing \item and missing \endgroup. After hours of searching I still have no idea how to solve the problem.
I am really thankfull for suggestions!
Stefan