There is not an SP2 "beta." We give test maps to certain people only when we want to. I don't know where you got the idea that there was one, but your source is either joking or misinformed.

As for the exception, you really need to be more specific as to what you're doing. That's such a general error; almost anything can cause it. If you did everything correctly (see HEK tutorial for what that means) regarding setting up the map, you won't get one unless you were messing with things you shouldn't have been.