I notice it is failing to call method "error", not method "logger". I don't know the solution, but thought that might be a helpful clue.

EDIT: Hmm, ok I just read the api and my comment isn't very helpful. I think it would be helpful though to post the real code that throws the error, unless this sample code is also failing. Packages A,B,C appear to be standalone. How do they know anything about main or logger?