Thanks for your answer.
I checked it and the directory templates_c exists. The permissions is 777.
I contact my hoster to check how they handle open_basedir.

Hello, I moved the blog witze365.de to a new hoster. Now I have Problems with the site and I don't know what to do. Can anybody help me with the erros? Warning: file_exists(): open_basedir restriction in effect. File(/var/www/w01187cf/html/witze365/plugins/serendipity_event_karma/serendipity_event_k...