Hi saguaros I think I found the reason of this problem.
I set up this template on a subdomain new.virtualmagazin.com then I move it to virtualmagazin.com. I found in System Information/Folder permissions that both path of temp and log directory is still the subdomain's directories.
I enclose an image about it, you can see the 'new' in the path which is not OK.
My question is how (in which file) can I rewrite these wrong paths to the correct ones.
Thank you!
UPDATE: I modified the paths in the configuration php. The paths OK now, but they are unwritable. How can I change them to writable?