Network List error and NetworkList.Count is 0 on the client build

Hi, to preface this question, I don't really know what the problem is. I've looked through the documentation on NetworkLists as well as the forums but haven't seen anything with quite the same error, any help is appreciated. I'm trying to use a custom data type PlayerLobbyData in a NetworkList but I'm getting an error after the client joins the host. It continues to produce the error while the host(Unity Editor) is running.
The struct I made is attatched

***ERROR MESSAGE BELOW***

Code (CSharp):

1. NullReferenceException: Object reference not set to an instance of an object
2. Unity.Netcode.NetworkVariableSerialization`1[T].GetSerializer () (at Library/PackageCache/com.unity.netcode.gameobjects@1.0.1/Runtime/NetworkVariable/NetworkVariableSerialization.cs:239)
3. Unity.Netcode.NetworkVariableSerialization`1[T]..cctor () (at Library/PackageCache/com.unity.netcode.gameobjects@1.0.1/Runtime/NetworkVariable/NetworkVariableSerialization.cs:217)
4. Rethrow as TypeInitializationException: The type initializer for 'Unity.Netcode.NetworkVariableSerialization`1' threw an exception.
5. Unity.Netcode.NetworkList`1[T].WriteDelta (Unity.Netcode.FastBufferWriter writer) (at Library/PackageCache/com.unity.netcode.gameobjects@1.0.1/Runtime/NetworkVariable/Collections/NetworkList.cs:93)
6. Unity.Netcode.NetworkVariableDeltaMessage.Serialize (Unity.Netcode.FastBufferWriter writer) (at Library/PackageCache/com.unity.netcode.gameobjects@1.0.1/Runtime/Messaging/Messages/NetworkVariableDeltaMessage.cs:94)
7. Unity.Netcode.MessagingSystem.SendMessage[TMessageType,TClientIdListType] (TMessageType& message, Unity.Netcode.NetworkDelivery delivery, TClientIdListType& clientIds) (at Library/PackageCache/com.unity.netcode.gameobjects@1.0.1/Runtime/Messaging/MessagingSystem.cs:492)
8. Unity.Netcode.MessagingSystem.SendMessage[T] (T& message, Unity.Netcode.NetworkDelivery delivery, System.UInt64 clientId) (at Library/PackageCache/com.unity.netcode.gameobjects@1.0.1/Runtime/Messaging/MessagingSystem.cs:612)
9. Unity.Netcode.NetworkManager.SendMessage[T] (T& message, Unity.Netcode.NetworkDelivery delivery, System.UInt64 clientId) (at Library/PackageCache/com.unity.netcode.gameobjects@1.0.1/Runtime/Core/NetworkManager.cs:1871)
10. Unity.Netcode.NetworkBehaviour.NetworkVariableUpdate (System.UInt64 targetClientId, System.Int32 behaviourIndex) (at Library/PackageCache/com.unity.netcode.gameobjects@1.0.1/Runtime/Core/NetworkBehaviour.cs:653)
11. Unity.Netcode.NetworkBehaviour.VariableUpdate (System.UInt64 targetClientId) (at Library/PackageCache/com.unity.netcode.gameobjects@1.0.1/Runtime/Core/NetworkBehaviour.cs:602)
12. Unity.Netcode.NetworkBehaviourUpdater.NetworkBehaviourUpdate (Unity.Netcode.NetworkManager networkManager) (at Library/PackageCache/com.unity.netcode.gameobjects@1.0.1/Runtime/Core/NetworkBehaviourUpdater.cs:51)
13. Unity.Netcode.NetworkManager.OnNetworkManagerTick () (at Library/PackageCache/com.unity.netcode.gameobjects@1.0.1/Runtime/Core/NetworkManager.cs:1604)
14. Unity.Netcode.NetworkTickSystem.UpdateTick (System.Double localTimeSec, System.Double serverTimeSec) (at Library/PackageCache/com.unity.netcode.gameobjects@1.0.1/Runtime/Timing/NetworkTickSystem.cs:102)
15. Unity.Netcode.NetworkManager.OnNetworkPreUpdate () (at Library/PackageCache/com.unity.netcode.gameobjects@1.0.1/Runtime/Core/NetworkManager.cs:1568)
16. Unity.Netcode.NetworkManager.NetworkUpdate (Unity.Netcode.NetworkUpdateStage updateStage) (at Library/PackageCache/com.unity.netcode.gameobjects@1.0.1/Runtime/Core/NetworkManager.cs:1476)
17. Unity.Netcode.NetworkUpdateLoop.RunNetworkUpdateStage (Unity.Netcode.NetworkUpdateStage updateStage) (at Library/PackageCache/com.unity.netcode.gameobjects@1.0.1/Runtime/Core/NetworkUpdateLoop.cs:185)
18. Unity.Netcode.NetworkUpdateLoop+NetworkPreUpdate+<>c.<CreateLoopSystem>b__0_0 () (at Library/PackageCache/com.unity.netcode.gameobjects@1.0.1/Runtime/Core/NetworkUpdateLoop.cs:232)
19.  

 

This was an issue not so long ago but I think was fixed in the version you're using. Try the latest version of Netcode in case there have been other fixes.

 

I believe I am using the latest, Version 1.0.2 - September 13, 2022.

 

The issue looks to be the implementation of NetworkSerialize, try:

Code (CSharp):

1. public void NetworkSerialize<T>(BufferSerializer<T> serializer) where T : IReaderWriter

 

That seems to have done the trick thank you! Yesterday I tried this but It was showing errors in VScode, and today it worked with no problems. Maybe I forgot to try this after updating NGO.