Man, after reading all 60 acronyms of "MOB," the only one that seems to fit is Method of Build, which is consistent with the second error and Craig's point above. I.e., there are objects the encoder chokes on.
Then again, it might mean "Mail order bride," "morbidly obese," or "money over b****es" so you could try proposing to it, eating more, or just pay it and see if it works.