Handling Explosions of PlayerSpawned Objects? "Trying to send command for object without authority."

Unity Engine
1

So I want to spawn an explosion from a missile that the player shoots.

If I try to add the “explosion” like this:

(it is actually for a mine but it is actually the same)

    void OnCollisionEnter(Collision coll)
    {
        Debug.Log("playercollision");

        if (coll.gameObject.tag == "Player")
        {
            CmdOnCollision();
            NetworkServer.Destroy(gameObject);
            col = true;
        }

      
    }

    [Command]
    void CmdOnCollision()
    {

        expo = (GameObject)Instantiate(
             exp,
            minecoll.transform.position,
            minecoll.transform.rotation);


        NetworkServer.Spawn(expo);



    }

it give me the following error

“Trying to send command for object without authority.”

I actually have a workaround, where I check the collision of the missile with a static variable and then add the explosion prefab over the shooting script.
But there are 2 problems,

1st I can only instantiate one missile at once. If I instantiate more then one missile I only can destroy the last missile because the script loses the properties of the others.

2nd I want to have the bullets/missiles/mine etc. instantiate their explosions themselves and destroy themselves too.

How can I achieve giving my objects player authority?

2

got it fixed by myself

spawning with
NetworkServer.SpawnWithClientAuthority(expo, m_Identity);

getting the identity with

m_Identity = obj.GetComponent().connectionToClient;