Originally Posted by chume
I encountered the same error yesterday after upgrading to 3.0.41 and found out that the web folder in the /var/www folder is owned by root.root instead of the webx.clientx user.
Everything started working after the ownership of /var/www/domain.com/web is changed.
I hope this helps.
Everything in /var/www/domain/web is set to webx.clientx, except for the stats-folder (owned by root). I cross-checked with another site, on another server, where the stats-folder is owned by root.root too.
I failed to mention that the upgrade concerned the Debian Squeeze distribution. Ispconfig already was 188.8.131.52