As near as I can tell, you're trying to use a feature (window translucency and shadows) which are not enabled in your x-server.
As the message says, you need to be using XOrg 6.8 or greater. Then you have to manually edit the x org config file and add
Code:
Section "Extensions"
Option "Composite" "Enable"
EndSection
Then restart X (
CTRL+ALT+Backspace usually works).