Hey, FYI I was having the same issue, and here's my solution:
- Go to X:\Program Files\Steam\SteamApps\common\Mount & Blade II Bannerlord\bin\Win64_Shipping_Client
- Delete "0Harmony.dll"
That was the one thing not working for me. I guess that .dll was added by a mod, and since it's not in the Module folder it's easy to overlook. Hope it helps!