Some time after installing of ubuntu, we are getting errors with visual effects/any dock tools like docky or AWN/ubuntu themes. i.e “You need to unable Desktop Effects (Compositer) to apply and customise themes.
Following are the simple steps to get rid out of that error.
- Press Alt-F2 to open the “Run Application” box / Open the terminal
- Type “gconf-editor” and press Enter
- Go to apps >> metacity >> general
- Select the check box next to “compositing_manager”
Now just restart that dock tool/ubuntu and error will be resolved.
If still its not resolved than you need to install 2 more utility for those effects.
shell> apt-get install compiz
shell> apt-get install simple-ccsm
Now I’m sure that it will work 
first command it said compiz was the latest and greatest ran second line and bam error gone ty!