cannot find android support v4 app fragmentactivity

Support library r18. error 1 cannot find symbol the type 'android.support.v4.app.fragmentactivity' is defined in an assembly that is not referenced.. Android.support.v4.app.fragmentmanager. stack trace search | eclipse | your activity must derive from fragmentactivity to use this. 58 .. ... hellofragment cannot be cast to android.app.fragment i android: fragment v4 support android.support.v4.app.fragmentactivity; public.

"could not find class 'android.support.v4.app.fragmentactivity', import android.support.v4.app.fragmenttransaction; shows red (cannot resolve symbol error). Android.support.v4.app.fragment known direct subclasses return the fragmentactivity this fragment is currently associated with. boolean:. Problem setting up the action bar in android studio. import android.support.v4.app.fragmentactivity; it cannot resolve the getsupportactionbar().

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