Authorative Movement; NullReferenceException: Object reference not set to an instance of an object

Options
Dear Forum!

After having first asked this question: link here:link here, I tried a lot.

Background: I am trying to implement the Authorative Movement, following this tutorial - link here - and I keep getting the same error. I have used different prefabs with different entity settings.

I have also tried the Advanced Tutorials folder in the samples folder. The error I got was still the same. Now I am starting to think this is not a programming error. Might it be a setup error? Or must I use two different laptops for it to work?

Here is the error code:
NullReferenceException: Object reference not set to an instance of an object
Bolt.AdvancedTutorial.ServerCallbacks.SceneLoadRemoteDone (BoltConnection connection) (at Assets/Photon/samples/AdvancedTutorial/scripts/Callbacks/ServerCallbacks.cs:90)
BoltInternal.GlobalEventListenerBase.SceneLoadRemoteDoneInvoke (BoltConnection connection) (at <700d983e76cb4a2c8382c87b066b3956>:0)
UnityEngine.Debug:LogException(Exception)
BoltLog:Exception(Exception)
BoltInternal.GlobalEventListenerBase:SceneLoadRemoteDoneInvoke(BoltConnection)
BoltInternal.BoltCore:InvokeRemoteSceneCallbacks()
BoltInternal.BoltCore:Poll()
BoltPoll:FixedUpdate()

I haven't changed anything from the Advanced Tutorials code. I am really confused.

Any help is much appreciated :)

Cheers,
Laurence.