Android studio not rendering layout preview

Question

I\'ve been using Android Studio 0.8.6 to develop apps and am having problems with the layout preview when using API21. I get the following error:

Rend

Answer 1

I'm facing the same problem in android studio 2.2

This is what I did and nothing

-Clean Project

-Rebuild project

-Sync Gradle

The only thing that actually worked for me was Restarting android studio (close and reopen)