Comment 2 for bug 882810

Apologies for not commenting earlier, but it looks like you are trying to run g15-desktop-service as root, maybe from another login via "sudo" or "su"?

g15-desktop-service need only be run as an ordinary user. In fact it *must* be run as the user who's desktop it is for. Permissions are arranged by the udev rules thar are added on installation.

The only portion that needs to be run as root is "g15-system-service", and this is only required when you are using the kernel driver, and even then it should be started automatically when Gnome15 requires it.