The error indicates that one of your DLLs cannot initialise.
Seeing as this isn’t an issue in the modded realm, it’s likely to be related to our anti-cheat service, Easy Anti-Cheat.
Please try repairing it using the using the EasyAntiCheat_Setup executable located here:
C:\Program Files (x86)\Steam\steamapps\common\Warhammer Vermintide 2\installers\EasyAntiCheat