I have problem with ClientScene.RegisterPrefab

Hello, I have 2 scenes, in the first i have the network manager and network manager hud where specified the offline and online scenes, here i don't specified the spawnable prefabs.

In the second, i have a script where i specified the prefab to spawn. Here first to spawn i registered the prefab:

 public override void OnStartClient()
 {
     base.OnStartClient();
 
     foreach (GameObject obj in asteroidPrefabs)
     {
         ClientScene.RegisterPrefab(obj);
     }
 }

then if isServer i instanciate the prefab and then i spawn the prefab. The problem is on the client: I received the error on the client like (on the host the spawn is ok):

Failed to spawn server object, did you forget to add it to the NetworkManager? assetId=d8b3239a5790cd944ad93a8f8effa2b0 netId=6 UnityEngine.Networking.NetworkIdentity:UNetStaticUpdate()

What is wrong? i following the manual: https://docs.unity3d.com/Manual/UNetSpawning.html

ps: i am trying to use ClientScene.RegisterPrefab and don't the registered spawnable object of Network Manager.

Here there is the project: https://drive.google.com/file/d/1e2VpyKc59Zid5lXjuVFL8HqBsJWCNAbF/view?usp=sharing

Thanks, bye