There are two options to this problem. One is to get a friend that has finished MooShu to try and go in. I had a friend that couldn't get in either and I was perfectly able to. So I gladly helped him out. The other is that maybe you have missed someone along the way. That's the only reason I can think of that you wouldn't be able to enter a building you were meant to in the first place. Hope that helps you out a bit.