Dynamic Prefabs in a Multiplayer Game

Hello, sorry if my english is bad.
So I'm currently making an RTS game. There are lots of types of characters so I decided to use scriptable objects to create different types of characters. I also created a base prefab which contains the basic components needed for a character, designed that other components will be added later on instantiation to create the different units. I inserted this base prefab on my NetworkManager as a spawnable prefab.
I spawn units like this:

Code (CSharp):

1. [Command]
2.     public void CmdSpawnObject (int spawnableObjectIndex, Vector3 position, Quaternion rotation) {
3.        
4.         //gets base prefab
5.         GameObject go = NetworkManager.singleton.spawnPrefabs[UnitSpawnIndex];
6.        
7.         //gets desired unit scriptable object
8.         PlayerUnit playerUnit =  unitGroup.units[spawnableObjectIndex];
9.        
10.         //instantiates the base prefab
11.         go = Instantiate (go, position, rotation);
12.        
13.         //adds components to the base prefab using the sciptable object
14.         playerUnit.Initialize(go);
15.        
16.         //assigns the unit to the player
17.         NetworkIdentity ni = go.GetComponent<NetworkIdentity> ();
18.         NetworkServer.SpawnWithClientAuthority (go, connectionToClient);
19.         RpcAssignObject (ni, spawnableObjectIndex);
20.  
21.     }

This creates a problem that only the server has the version of the unit that has the added components. The client on the other hand instantiates only the base prefab.

Because of this, I tried to also add the needed components using a ClientRpc. This made it so that the unit on the client has the same components. But the when I invoke Commands on the added components this error comes up:



Thank you to anyone who will help.

 

Code (CSharp):

1. NetworkIdentity ni = go.GetComponent<NetworkIdentity> ();

you're calling networkidentity component in server but clients don't know that component try this

Code (CSharp):

1. RpcAssignObject (go, spawnableObjectIndex);

and in RpcAssignObject get networkidentity component with go.GetComponent<NetworkIdentity>();