why MenuItemCompat.getActionProvider returns null?

Question

I tried to use android.support.v7.widget.ShareActionProvider on actionbar in my app. So I followed the example from android document but got some issues.
Here\'s my m

Answer 1

I had the same type of error. MenuItemCompat.getActionProvider returned null.

My problem was in ProGuard. Turning ProGuard off solved it for me.