Stage Selection Crahses

[Sir_Ham_Sandwhich]

I have used the stage expansion tutorial, and the first couple of stages work fine. but some stages i add such as the castlevania clock tower and the blue moon battle ship dont work at all. when i select them on the stage selection screen it freezes with that loud beeping noise. what could be the problem? any advice on how i can fix this so this dosnt keep happening with more stages.