I got the same problem, but with alot of googling I found the answer! See this page
Quote from the link:
# An unexpected error has been detected by Java Runtime Environment:
#
# Internal Error (classFileParser.cpp:2924), pid=5364, tid=6644
# Error: ShouldNotReachHere
- That’s because we are using Android’s JUnit stub implementation. Go to Run -> Run As -> Run configurations again and in the recently created JUnit configuration Classpath’s Bootstrap Entries remove Android Library
- Then Add Library, using Advanced… button, and add JRE System Library and JUnit 3
- Apply and Run
Try this, it worked for me.