Critital Error after switching from fullscreen to Borderless

I was in the middle of the game and wanted to change to borderless and all of a sudden the game crashes and I cannot load back in. An error message saying "Critical error" happens and I need to create a memory dump. Game got remaked but I still can't fix the problem. What do I need to do?

I cant even get in the Practise Tool. Full repair on client doesn't work either

Can somebody help me??