The errors are, for the most part, self-explanatory, but especially if you're a newer developer or new to the language they might not be very clear what they mean. You can find a guide to runtime errors here which might give you a bit more clarity. If there is still something that you don't understand from them, do a quick forum search for it and if you still can't find anything on it, feel free to post the specific error on the Developer Help forums so that others can benefit from the information in the future.

If you're experiencing a full on crash of your game or application, that's another bag of worms. Your best bet there is to make a bug report on it so that Lummox can track down the root cause.

Hope that helps!