You're using apache2-mpm-itk and for some reason it doesn't have enough rights to switch to a different system group using setgid(). Make sure Apache is running as root. I can't be any more specific if I don't have more information about your system.
You're using apache2-mpm-itk and for some reason it doesn't have enough rights to switch to a different system group using setgid(). Make sure Apache is running as root. I can't be any more specific if I don't have more information about your system.
(Yes, using apache2-mpm-itk means Apache must run as root. Read this ("Quirks and warnings") before screaming.)