Hi laggyluk - a bit difficult to say with just this, the stack trace looks a bit odd. Are you able to share your log files (in the Saved directory)?
You can send it to contact @ runeberg (dot) io if you dont wish to share it publicly.
**EDIT: **Also, a copy of the RunebergVRPlugin.uplugin.uplugin file in your project. Thanks.
Cheers,
Rume.