Cannot setup floating action buttons as class cannot be found (Android Studio)

Question

So I am pretty new to android and I am trying to setup a floating action button with the Android Design Support Library using this guide in Android Studio.

My Projec

Answer 1

I had the same issue and updated the Android Support Repository", "Android Support Library"(22.2.1) and "Android SDK Tool"(24.1.2) using SDK manager now its working fine. Once update finish rebuild the project. For more https://developer.android.com/tools/support-library/setup.html