Jep (or Python) seems to have a problem interfacing with Scala collections. If a Scala List is in scope, any Python cell will fail to run with the error:

Uncaught exception: <class 'TypeError'>: Cannot create a consistent method resolution order (MRO) for bases HasNewBuilder, GenTraversableLike (jep.JepException)

It looks like this is a normal Python error, but it seems like a regression for Jep. We should minimize, report, and maybe try to fix this error upstream in jep.