QBR? If I recall correctly QBR isn't required by any mod... Since its just something for you to make some quickbattles with a bit more options to set up...
LoadEngineeringExtension.py, which is appearing in that dump, is from QBautostart. Do you have it installed correctly and all?
Unless... Mleo, Ambiguity.py is originally from QBR? I tho it was from QBautostart too...