Today downloaded the studio 3.0 beta 2.0 version, after that tried to open an existing project in it and faced some difficulties, most of them I could solve with the help of
I had the same errors(SimException) that you encountered. I had 3 modules in android clean architecture project:
solution
navigate to File/Project Structure...
make sure your modules has the same Source and Target Compatibility (1.8 in this case)