Collectible Card Game Headquarters

The last time I played Forge I was about to start a new Quest mode. I deleted the old ones, chose a Card Pool and built a deck. Then, as I wanted to start the Quest, Forge suddenly crashed. i tried to start it again, but everytime i crashes again. I also tried an older Version, but there's the same issue.
I play the newest version (1.5.56)

I attached the log because the forum says my post it's "too spamy for a new user".

I always had similar crashes if I modified my quest world files (world definition, opponents etc) in a way that was incorrect. The game does not tell you if there are too few enemies in a world folder, or a required parameter for an enemy deck is missing, or anything similar, it just crashes.
So if you did anything to those files it can result in this.