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Bryan Ingwersen214 Points
Android studios encountered a rendering problem because a class could not be found.
The class android.support.v7.internal.widget.ActionBarOverlayLayou could not be found so Android Studios can't render the phone image on the right hand side of the app.
There are a few things that could fix your issue.
1) You could set your theme to something like Holo.light.
2) You could make sure you have installed the Support Library in the SDK manager and have a line simiar to "compile 'com.android.support:appcompat-v7:19.1.+'"(appropiate to whatever version of the support library you are using) in your build.gradle file. For more information on this see this stackoverflow article.
If neither of these fix your issue, we can try some more troubleshooting methods, but would be easier if you post your code and xml(better if you can put the project on Github).