I am getting the exact same error. The trainer activates normally when on the menu screen, but the game crashes to desktop when you try to start playing. I've tried both with loading a previous save and starting a new game, and I get the same error both times. If I load the game without activating the trainer, it loads properly, and if I then try to activate the trainer from within the game, the game crashes. I also tried uninstalling and reinstalling the game with no luck. I'm not using any mods. I do hope you are able to figure out a solution!
For reference. The trainer DOES activate on the menu screen, it just crashes when loading a game. While in the game the trainer doesn't activate, it just crashes the game.
I got the same error and same message in the trainer debug.
everything was fine in the game menu, I can activate the trainers and toggle the options on & off. but when I load the saved playthrough or start a new one, the game crashes to desktop.