Referencing Google Play Library Error

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http://stackoverflow.com – This is happen to me when referencing google play library project to my another project. What kind of error is this : Of course, my project still error importing the Android Google Maps V2. import com.google.android.gms.maps.CameraUpdateFactory; import com.google.android.gms.maps.GoogleMap; import com.google.android.gms.maps.MapFragment; import com.google.android.gms.maps.model.BitmapDescriptorFactory; import com.google.android.gms.maps.model.LatLng; import com.google.android.gms.maps.model.Marker; import com.google.android.gms.maps.model.MarkerOptions; I also tried the example provided (HowTos)