Unexpected namespace prefix “app” found for tag RelativeLayout - Android?

Question

I need to use BottomSheetBehavior with ScrollView but it says to me :

Unexpected namespace prefix \"app\" found for tag RelativeLayout
         


        

Answer 1

For someone who gets the similar error Unexpected namespace prefix “app” found on textView, you might need to change TextView to android.support.v7.widget.AppCompatTextView.