Command function called on server

When i try to run a command function from a script attached to my player object, while the player client is connected to the server, it does not run. Instead, I get this error:

Command function CmdPlayerSpawned called on server.

UnityEngine.Debug:LogError(Object)

playerMove:CallCmdPlayerSpawned()

playerMove:Start() (at Assets/Player Scripts (PROJ_S)/playerMove.cs:71)

This is the relevant piece of code from my player script. I can post more if needed.

     [Command]
     void CmdPlayerSpawned()
     {
         GameObject player = (GameObject)Resources.Load("Player", typeof(GameObject));
         ClientScene.AddPlayer(playerControllerId); //trigger NetworkServer.AddPlayerForConnection on the NetworkManage.cs
         ClientScene.RegisterPrefab(player); //registers the player prefab with the server so that it can be spawned on clients later
 
         GameObject NetworkManager = GameObject.Find("NetworkManager");
         NetworkManager.GetComponent<NetworkManage>().playerSpawnOnClient(); //calls playerSpawnOnClient from the Network Manager to make this player spawn on every client, not just the server
     }

All of that is inside a NetworkBehaviour class.