Error : Ambiguous method call. Both findViewById (int) in AppCompactActivity and Activity

Question

I am getting the error: \"Ambiguous method call\" on initializing Toolbar using Android Studio 3.0 RC1. I have extended my Activity with AppCompatActivity and compiling my appli

Answer 1

For me none of the given solutions worked, however I had this issue because I had both 25 and 27 android sdk installed on my computer. As soon as I removed the sdk 25, the problem disappeared.