No 1. Does this happen all the time? Have you tried small test levels (prefabs for example)? Have you imported any of your own media?
I ask this because I was getting a similar problem, it was bombing out 8 times out of 10 when testing a level with my own media in it, and I couldn't even build a level without and "Error 0 Extra info: 0 0" error! I email Lee and he suggested it could be incompatible media (as I was using some of my own, made with MagicFPS), I rebuilt the level from the ground up and that seems to have eliminated the error.
Try test levels, add bits at a time and test them as you go along, and good luck!