[2022] Error after hitting 8 on 2 characters

Your installation appears to be incomplete. Please use the ‘Verify Integrity of Game Files’ option via the Steam client:

1. Right-click Darktide in your Steam library sidebar
2. Select ‘Properties’
3. Select the ‘Local Files’ tab
4. Select the ‘Verify the Integrity of Game Files’ button
5. When complete, close and reopen Steam