No room available?

I went on to the MyHousing portal to sign up for my dorm for the upcoming fall 2017 semester. I really don’t care on which hall I get placed into, but it seems like when I try to proceed to Stage 4 of the process, (OHS), it says that there are no rooms available for me and that my OHS process has been denied for some reason. I already paid my housing deposit, and finished the first 3 stages that are required in order to proceed. Anyone know what the problem is?