I got stuck in the problem in which I can’t able to launch any projects of my workspace related to android. Here the screen shot of error.I have tried all the stuff related cleaning projects and then re-building it.Also my projects doesn’t contains any error.Please help me out if someone faced such type of error. Thanks in Advance.

Great example for a totally useless error message. If all android projects are affected, it’s most likely a problem with the android plugin and not with the projects themselves. You could try removing and reinstalling the plugins.
I probably wouldn’t waste time with this and just download a new copy of eclipse.
A solution in this very similar question was to create a new workspace and import the projects there: Eclipse says my Android project(s) contain(s) errors, but there aren't any
The answer there suggests to check
Window -> Show View -> Problemsfor some indication why this error is happening.In this thread updating the android sdk apparently worked.