Client does not spawn.

Hello,

Sorry for the poor English.

I'm using Steamworks.NET and SteamNetworkingTransport to create a multiplayer game.
Stemworks.NET: https://steamworks.github.io/
SteamNetworkingTransport: https://github.com/Unity-Technologi...m.community.netcode.transport.steamnetworking

When a client connects to the host, two player prefabs are created on the host screen, but no player prefabs are generated on the client screen.

Also, the following error is sent to the client side:
[Netcode] Deferred messages were received for a trigger of type OnSpawn with key 3, but that trigger was not received within within 1 second(s).

Anyone know the cause and how to fix it?

Thank you.

 

thank you for your reply.

I have checked that post, but it seems different from my problem.
In my case, the Player Prefab is not spawn on the client side.

Maybe there is a problem with the SteamNetworkingTransport I'm using, so I'm investigating it, but I'm not good enough to solve the problem.

 

Sorry for my lack of explanation.

When the host starts the game, the host's Player Prefab is instantiated, and when the client connects to the host, the client is instantiated on the host's screen.
However, neither the host nor itself is instantiated on the client side.


I have confirmed that the PlayerPrefab has been set to NetworkManager.

 

Thank you for your support.

1. Yes, PlayerPrefab has NetworkObject Component.
2. I try PlayerPrefab with just a cube(add NetworkObject).
　However, the problem remained largely the same. PlayerPrefab still spawn only on the host side.
　Mostly, I mean the error message is gone.
　[Netcode] Deferred messages were received for a trigger of type OnSpawn with key 3, but that trigger was not received within within 1 second(s).

By the way, I got the following error on the host side. Any hints for solving the problem?
Exception: GetSceneOriginHandle called when SceneOriginHandle is still zero but the NetworkObject is already spawned!

 

NGO version was using 1.0.1.
I just updated to 1.1.0 and tried again, but the result was the same.

 

I found myself struggling with this problem for about a week. lol

Is it possible that this issue relies on a custom transport?
In that case, I'm thinking of changing the game's network from the ground up. . .

 

thank you so much for your long time support.

I tried using UnityTransport, but the result did not change.
The host and client PlayerPrefabs are instantiated on the host side, but neither is instantiated on the client side.

NetworkManager.Singleton.StartClient()
I'm doing the above inside Start(), could this be the problem?
I'm wondering if it's a problem that the NetworkManager specification calls StartClient() at the beginning of the Scene.

Actually, at the beginning of development, the HUD was displayed at the beginning of the Scene, and the implementation was to select the host and client from there. it was working fine.
This problem occurred after removing the HUD and implementing an implementation that automatically determines the host and client after the scene changes.

 

Host/Client: At scene start
But the host starts the scene first. The client starts the scene after a delay.

I started the StartClient() with a delay of 100 frames from the beginning of the scene, but the result was the same

I can't think of any other reason. . .

 

I tried StartClient() 10 seconds after the scene started, but the result was the same.

I noticed that NetworkManager is multiple instantiated. A Google search seems to show that the same issue is happening to different people. I'm not sure if this is the reason why the PlayerPrefab is not instantiated on the client side, but it's possible and I'll look into it.

 

Umm...
The problem of multiple instances of NetworkManager being instantiated has been resolved. This is simply because the scene where the NetworkManager is placed was loaded every time a SteamAPI callback came.

I tried with a single NetworkManager, but the result was the same.

 

1. I tried only 1 NetworkManager.
2.I will try it later.
I found an error that might help. It seems to be happening inside StartHost().

NullReferenceException: Object reference not set to an instance of an object
Unity.Netcode.NetworkBehaviour.InitializeVariables () (at Library/PackageCache/com.unity.netcode.gameobjects@1.1.0/Runtime/Core/NetworkBehaviour.cs:607)
Unity.Netcode.NetworkBehaviour.InternalOnNetworkSpawn () (at Library/PackageCache/com.unity.netcode.gameobjects@1.1.0/Runtime/Core/NetworkBehaviour.cs:465)
Unity.Netcode.NetworkObject.InvokeBehaviourNetworkSpawn () (at Library/PackageCache/com.unity.netcode.gameobjects@1.1.0/Runtime/Core/NetworkObject.cs:914)
Unity.Netcode.NetworkSpawnManager.SpawnNetworkObjectLocallyCommon (Unity.Netcode.NetworkObject networkObject, System.UInt64 networkId, System.Boolean sceneObject, System.Boolean playerObject, System.UInt64 ownerClientId, System.Boolean destroyWithScene) (at Library/PackageCache/com.unity.netcode.gameobjects@1.1.0/Runtime/Spawning/NetworkSpawnManager.cs:587)
Unity.Netcode.NetworkSpawnManager.SpawnNetworkObjectLocally (Unity.Netcode.NetworkObject networkObject, System.UInt64 networkId, System.Boolean sceneObject, System.Boolean playerObject, System.UInt64 ownerClientId, System.Boolean destroyWithScene) (at Library/PackageCache/com.unity.netcode.gameobjects@1.1.0/Runtime/Spawning/NetworkSpawnManager.cs:489)
Unity.Netcode.NetworkSpawnManager.ServerSpawnSceneObjectsOnStartSweep () (at Library/PackageCache/com.unity.netcode.gameobjects@1.1.0/Runtime/Spawning/NetworkSpawnManager.cs:755)
Unity.Netcode.NetworkManager.StartHost () (at Library/PackageCache/com.unity.netcode.gameobjects@1.1.0/Runtime/Core/NetworkManager.cs:1182)
GameManager.StartHost () (at Assets/GameManager.cs:57)
GameManager.Start () (at Assets/GameManager.cs:33)

 

It seems that the above error is the cause.
However, the cause is unknown.
I tried it with a simple scene with exactly the same NetworkManager and GameManager and it works fine. The PlayerPrefab uses exactly the same.
Do you know the reason?

 

After a week of fighting, I finally found the cause of all the evils!

The NetworkObject set to this GameObject seems to be the cause of everything.
If I remove the NetworkObject it works fine.
However, this GameObject must have a NetworkObject. What should I do?


It worked fine even with Key(Script) disabled. Is there any reason?

Code (CSharp):

1. using Unity.Netcode;
2.  
3. public class Key : NetworkBehaviour
4. {
5.     public string Name = "keyName";
6.     public int KeyId = -1;
7.  
8.     public Key(string name, int keyId)
9.     {
10.         Name = name;
11.         KeyId = keyId;
12.     }
13.  
14.     public void Set(Key key)
15.     {
16.         Name = key.Name;
17.         KeyId = key.KeyId;
18.     }
19.  
20.     public void Set(string name, int keyId)
21.     {
22.         Name = name;
23.         KeyId = keyId;
24.     }
25.  
26.     public void DestroyKey()
27.     {
28.         DestroyImmediate(this.gameObject);
29.     }
30.  
31.     [ServerRpc(RequireOwnership = false)]
32.     public void DestroyKeyServerRpc()
33.     {
34.         this.GetComponent<NetworkObject>().Despawn(true);
35.     }
36.    

Also, I didn't do anything with this GameObject at the time this error occurred.
Just being in the scene will cause an error.

 

I had a similar problem were there are spawning players at the host but not at the client side, but with a different Exception.
Exception: Scene '' couldn't be loaded because it has not been added to the build settings scenes in build list.
Unity.Netcode.NetworkSceneManager.SceneHashFromNameOrPath (System.String sceneNameOrPath)

But my scene was added in the build settings so I found I work around by disabling the Scene Manager in the NetworkManager. This works for now...

 

This helped me in the same case issue when player prefab doesn't spawn on client.

 

Yeah as of April 2024 seems like this issue still persists... disabling the Scene management tick did the work. Many Thanks!