Last version of ADT in my eclipse was API 16, so I updated ADT (eclipse->Help->Install new software->Work with: ADT ) and then multiple errors occurred!!!
I can not even open Android SDK Manager !
There are some Screenshots from error :
How can I roll it back?!
P.s : Before Updating ADT I tried to add "SQLiteManager" PLugin by copying a jar file into "eclipse/dropins/" folder, but eclipse did not run anymore. So I removed the jar file and eclipsed lunched successfully!