Help! I can't open desktop-effects

luyibo

[root@localhost abo]# desktop-effects
gtk-window-decorator: Screen 0 on display ":0.0" already has a decoration manager; try using the --replace option to replace the current decoration manager.
compiz (core) - Warn: SmcOpenConnection failed: Authentication Rejected, reason : None of the authentication protocols specified are supported and host-based authentication failed
compiz (core) - Fatal: No GLXFBConfig for default depth, this isn't going to work.
compiz (core) - Error: Failed to manage screen: 0
compiz (core) - Fatal: No manageable screens found on display :0.0

why? who can tell me? my OS is fedora 9

onelay

show your...
1 glxgears
2 /etc/X11/xorg.conf