MLAPI Tutorial Help

Hey all,
I am having trouble with the tutorial (Yes, I've tried Googling). I am currently at the end of Part 2 of 3. (Building on "Hello World"). I was wondering if someone could help. Thanks!

Error: NullReferenceException: Object reference not set to an instance of an object (It is talking about the MLAPI.NetworkManager.StartHost function. Longer log below)

Relevant Details

1. As Part 1 (Your First Networked Game "Hello World") instructed, after I finished working on the PlayerPrefab in the Scene, I dragged it into the Assets/Prefabs folder and then deleted it from the scene. But at the beginning of Part 2, I saw in the videos that the PlayerPrefab was in the scene and was confused. So I did all of the Part 2 PlayerPrefab instructions onto the PlayerPrefab in the assets folder and then dragged it into the scene.
2. I included the following 2 includes at the top of my code. Besides that, all of the scripts are just copy-pasted from the tutorial itself.
   
   Code (CSharp):

   1. using System.Collections;
   2. using System.Collections.Generic;

Thanks for your help!




The error in full:

NullReferenceException: Object reference not set to an instance of an object
MLAPI.NetworkManager.StartHost (System.Nullable`1[T] position, System.Nullable`1[T] rotation, System.Nullable`1[T] createPlayerObject, System.Nullable`1[T] prefabHash, System.IO.Stream payloadStream) (at Library/PackageCache/com.unity.multiplayer.mlapi@3e3aef6aa0/Runtime/Core/NetworkManager.cs:555)
NetworkManagerEditor.OnInspectorGUI () (at Library/PackageCache/com.unity.multiplayer.mlapi@3e3aef6aa0/Editor/NetworkManagerEditor.cs:371)
UnityEditor.UIElements.InspectorElement+<>c__DisplayClass59_0.<CreateIMGUIInspectorFromEditor>b__0 () (at /Users/bokken/buildslave/unity/build/External/MirroredPackageSources/com.unity.ui/Editor/Inspector/InspectorElement.cs:546)
UnityEngine.GUIUtility: ProcessEvent(Int32, IntPtr, Boolean&) (at /Users/bokken/buildslave/unity/build/Modules/IMGUI/GUIUtility.cs:189)​

 

Solution: After you drag the PlayerPrefab into the Network Manager (specifically, into the NetworkPrefabs field), you need to mark it as "Default Player Prefab".

 

Thank you helped me out as well!