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

You need the Library design, in the build.gradle file add:

compile 'com.android.support:appcompat-v7:25.1.1'
compile 'com.android.support:design:25.1.1'

Then Sync the Gradle, build and Reresh