[SOLVED] How to fix the black background of Cairo Dock?

To be honest, I am a big fan of Cairo Dock. It makes my desktop look more beautiful than what it would have been without Cairo Dock.

I was using it from the beginning of my Linux journey, in Ubuntu 11.04. Of course, I am a newbie to Linux, just started using it couple of months ago. And it has been a real learning experience. I used to hate Windows from the beginning - since Windows98 but