Whenever I attempt to load the Xmas Lemmings levels (all of them) I get an error message saying that "This level cannot be played as it doesn't have an exit!"

Truthfully this is my first attempt at using superlemmix so I suppose I might be missing something. I was able to load several other levels without issue, but all of the levels listed under Xmas 91 and Xmas 92 get this error.

edit:
This is SuperLemmix 2.8.9