Try testing on latest `develop` branch. The commits that broke it happened on 12/17. Everything in the project was renamed from `MapBox` to `Mapbox`

Take a look at https://github.com/mapbox/mapbox-ios-sdk/commit/cffd593b5d4ff2503737a0157bf36b91b3391a11 specifically `RMMapView.m` line 429

https://github.com/mapbox/mapbox-ios-sdk/commit/cffd593b5d4ff2503737a0157bf36b91b3391a11#diff-cc99abd5af5db8f48b362bcac3e8c307L429