problems with working of compiz in my system in ubuntu 9.04

[sunny vashistha]

this is the message displayed on
(terminal)..................................


address@hidden:~$ compiz
Checking for Xgl: not present.
xset q doesn't reveal the location of the log file. Using fallback
/var/log/Xorg.0.log
Detected PCI ID for VGA:
Checking for texture_from_pixmap: present.
Checking for non power of two support: present.
Checking for Composite extension: present.
Checking screen 1Comparing resolution (1280x800) to maximum 3D texture size
(4096): Passed.
Checking for Software Rasterizer: Not present.
Checking for nVidia: present.
Checking for FBConfig: present.
running under gnome seesion, checking for gnomecompat
Checking for Xgl: not present.
/usr/bin/compiz.real (video) - Warn: No 8 bit GLX pixmap format, disabling
YV12 image format


please help me out in solving my problem.....