Trying to synchronize NetworkObjectId

I am using netcode to spawn an object server side and synchronize that when a client next connect to server.
I am getting this error: [Netcode] [Object Scene Migration] Trying to synchronize NetworkObjectId (2) but it was not spawned or no longer exists!!
I have a single scene and I am not loading a second scene.
What I am doing wrong? I use a my own method to instantiate and spawn the object:

Code (CSharp):

1. internal static T Instantiate<T>(string resourcePath, string name, bool active = true, bool spawn = true) where T : MonoBehaviour
2.         {
3.             T prefab = (T)Resources.Load(resourcePath, typeof(T));
4.             prefab = Object.Instantiate(prefab);
5.  
6.             if (prefab != null)
7.             {
8.                 prefab.name = name;
9.                 prefab.gameObject.SetActive(active);
10.  
11.                 NetworkObject netPrefab = prefab.GetComponent<NetworkObject>();
12.                 if (netPrefab != null && spawn)
13.                     netPrefab.Spawn();
14.             }
15.             return prefab;
16.         }

 

You call this function only on the server and when a client tries to join you get the error?
is this prefab registered in the netwrok manager prefab list?

 

May be the problem is the netwrok manager prefab list: I thought the prefab were in the list, but not.
I am dropping the prefab, but the inspector don't let me do it. There is an element called DefaultNetworkPrefabs.
As I can remember, I have to put there. Is something changed?

 

In the new versions of netcode the network prefabs are in a sciptable object if I am not wrong. You need to put them in the object and then drag the object to the network manager. I am not sure how to do this.

 

It seems you are right!! Thanks. Now the object is synchronized