Troubleshooting

Why do I get a NullReferenceException in the console?

There can sometimes be a null reference appear in the console, linked to the Rotorcraft Prefab Builder window, this appears to be a Unity bug and can be ignored. (https://forum.unity.com/threads/assetdatabase-saveassets-is-giving-a-nullreferenceexception.778691/). Closing the Rotorcraft Prefab Builder window when you’re done with it should stop the error appearing.