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# 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.