kill Preferences -> GL Desktop?

[Marius Andreiana]

Didn't know what GL Desktop is, so I clicked it. I was already using
compiz, with preferences set in Compiz Settings Manager (ccsm).

On start, GL Desktop says
An error occurred while loading or saving configuration information
for gnome-compiz-preferences. Some of your configuration settings may
not work properly.

Seems it has a subset of Compiz Settings Manager options. Why does GL
Desktop still need to be kept?

Thanks,
-- 
Marius Andreiana