New map I created suddenly stopped working!!!

Hi, I've been creating a new map in OMSI and it was looking good. The roads were mostly from SIMPLESTREETS as I was checking they all worked. I went to create a depot file and put into it info about bus numbers and paint schemes. I then went back into OMSI and tried to load the map and it just gets stuck on "Loading map and new situation". It takes only a few seconds on the Spandau route. Any help on how to fix?!?