Well I want to highlight this and bring it all in this thread, as the rest of threads did not have a concluded answer, so before skipping into them here are the threads I referr
Seems like it is a eclipse bug. What you need to do is go to properties in the of the Android Project and in the Android Section. Add the library appcompat_v7 and remove the appcompat_v_7_2 (duplicate). Then you can remove the appcompat_v7_2 as a eclipse project. All errors fixed.
Just a workaround.