I have successfully managed to open Bannerlord again. I was getting the same error. My solution is: I deleted BUTR and Game's own extension. Restarted Vortex, reactived the extensions, and done. Then I enabled the mods one-by-one. Deployed mods in the Load order. I hope this works for you as well.
Migration to the new Bannerlord (BUTR) extension
in Vortex Support
Posted
I have successfully managed to open Bannerlord again. I was getting the same error. My solution is: I deleted BUTR and Game's own extension. Restarted Vortex, reactived the extensions, and done. Then I enabled the mods one-by-one. Deployed mods in the Load order. I hope this works for you as well.