unable to enable compiz desktop effects

[Jatin K]

Dear all

I'm trying to enable compiz desktop effects (windows wobble and 
workspace on cube ) ..using menu System-->Preferences-->Desktop Effect  
..but it fails and generates following[1] error


it was working very well... so there is no any problem with hardware or 
video driver

[1]
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) - Error: Could not acquire compositing manager selection 
on screen 0 display ":0.0"
compiz (core) - Fatal: No manageable screens found on display :0.0
Window manager warning: "" found in configuration database is not a 
valid value for keybinding "run_command_terminal"
Cannot register the panel shell: there is already one running.


can anyone tell me .....how to solve this

Regards
-- 

   °v°
  /(_)\
   ^ ^  Jatin Khatri

No MS