SWAG help. editing boss spawns suddenly causes errors in the source file and game hangs on loading profile data

Hi all. my game was working just fine until today. i noticed that while i have all bosses allowed to spawn on all maps that some bosses seemed to not be spawning. I assumed that SWAG goes down the list and spawns them in that order. So i decided to rearrange the bosses on factory as a test. i edited the factory_boss and factory_night_boss files. note that prior to changing the order of the bosses i was getting no errors. I ran the SWAG config and both factory files through a json checker and got no errors.

now when i try to load up the game the following happens:

game loads as normal until about 90% of profile data is loaded and then i get the following attached error. but the error is popping up in the source code of the mod and not my files.

if needed i can upload the files.