Hi Real Zapster, I do have an idea for you.
I also found I could not run the generated projects on BlackBerry 10, they would fail with a similar error.
Layer, I noticed the generated source code said to change the line for music from .mp3 to .ogg for BB10.
I haven’t tried it yet but it sounds like that would fix the issue. I am guessing the BB10 variant doesn’t support mp3 at the current time?
Please let us know if this fixes your issue or not. Good luck.