Error:Execution failed for task ':app:processDebugResources'.
com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command '/home/mobi27/opt/AND-Studio/Android/Sdk/build-tools/22.0.1/aapt'' finished with non-zero exit value 1
Just a f*king Invalidate Caches & restart did the trick for me
You just need to update the build tool version inside app/build.gradle
Now Clean Project and go ahead.
In my case I have this line in attrs.xml (values folder):
default - is reserved word, so I renamed it and fixed it!