Compiz installation ?

[William Case]

Hi;

What does this mean?

"]# desktop-effects
gnome-window-decorator: Screen 0 on display ":0.0" already has a
decoration manager; try using the --replace option to replace the
current decoration manager.
libGL warning: 3D driver claims to not support visual 0x4b
compiz: Root visual is not a double buffered GL visual
compiz: Failed to manage screen: 0
compiz: No managable screens found on display :0.0"

-- 
Regards Bill