Seems you have shader model 6 turned off for Vulkan. A shader in your game was probably written with sm6 instructions and switching to vulkan caused an incompatibility error.
in your project settings type in sm6 and check sm6 as your target shader format for vulkan (choose the format of your target platform Linux, Mac, Windows or Vulkan in general)
OFC you would need to repack the game for it to take effect.