I had the same problem, first thing came on mind was about repositories. So i checked build.gradle file for the whole project and added below lines, synchronized the gradle with project and problem solved! Hope will help someone else.

allprojects { repositories { jcenter() } } 

I had the same problem, the first thing that came to mind was repositories. So I checked the build.gradle file for the whole project and added the following code, then synchronized the gradle with project and problem was solved!

allprojects { repositories { jcenter() } }