So what would cause this error:
babylon.js:16 BJS - [17:00:25]: Unable to load from ./Assets/scene.babylon: loadAssets of unknown Lights: Name: P_Light, type: Point Name: D_Light, type: Directional Name: S_Light, type: Spot Name: H_Light, type: Directional Cameras: Name: Camera, type: UniversalCamera
When loading a .babylon file that has just a UniversalCamera, and the 4 lights its mentioning above in the error.
Everything works and all nodes come through fine. But this error drops everytime.