Desktop effects could not be enabled

[elk dolk]

Hi All,

I have Fedora 8 and want to enable desktop effects , compiz-fusion,compiz-fusion-extras-gnome , compiz-fusion-gnome, compiz-gnome, compiz-manager, compiz-fusion-extras are already installed ,when I try to enable desktop effects (Preferences->Look&Feel->Desktop effects) it says : Desktop effects could not be enabled


why?


       
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