This is a normal error when you import some project into eclipse.
I will show you how to solve this
First try cleaning the project from project->Clean.
If this didn’t work, then try these
Follow these steps
1. Go to Project » Properties » Java Build Path » Libraries and remove all except the “Android X.Y” (eg: Android 1.5). click OK.
2. Go to Project » Clean » Clean projects selected below » select your project and click OK.
Now your error may be gone.