Android - RelativeLayout Inflated As Button?

I have a weird problem. While running my Android application, I receive Exception: java.lang.ClassCastException: android.widget.Button cannot be cast to android.widget.RelativeLayo

Solution 1:

Delete the R.Java file and once recreated run the app it will work fine.

Solution 2:

The problem was that I've made one more layout file that I forgot about and it was for the same Activity byt different configuration. Problem solved.