Resolver error

[AdamBlade]

Hello,

I'm having some issue with some of my endpoints after annotating.

Resolver error at paths./venues/{venueId}.get.parameters.0.$ref
Could not resolve reference: Could not resolve pointer: /definitions/Nothing$ does not exist in document

This error is being thrown for a lot of them but I can't quite figure out what the issue is.
For the above I have something like this in my code

 private val getVenue =
    (apiOperation[VenuesResponse]("getVenue")
      summary "Get venue"
      tags(feature.venues, target.customer, authentication.none)
      parameter pathParam("venueId").description("Venue ID")
      description "Get venue details")
  get("/venues/:venueId", operation(getVenue))

I'm using an older version of scala 2.11.8 with scalatra version 2.7.0.