Networking attributes through interface

Hello, I have my WeaponControl script call functions in my weapons through IWeapon interface, but the problem is that I cannot use NetworkServer.Spawn(bullet); on my weapon, even with the [Command] attribute because I get error "NetworkServer is not active. Cannot spawn objects without an active server."

Everything works fine on host side though.

WeaponControl.cs

 public class WeaponControl : NetworkBehaviour {
     // Use this for initialization
     private IWeapon currentWeapon;
 
     void Start () {
 
     }
     
     // Update is called once per frame
     void Update () {
         if (!isLocalPlayer)
         {
             return;
         }
         if (CrossPlatformInputManager.GetButtonDown("Fire1" + tag))
         {
             currentWeapon.CmdCharge();
         }
         if (CrossPlatformInputManager.GetButtonUp("Fire1" + tag))
         {
             currentWeapon.CmdFire();
         }
     }
     public void Switched(IWeapon newWeapon)
     {
         Debug.Log("New Weapon");
         currentWeapon = newWeapon;
     }
 }    

IWeapon.cs

 public interface IWeapon
 {
     void CmdFire();
     void CmdCharge();
 }

Gun.cs

 public class GunController : NetworkBehaviour, IWeapon
 {
     public GameObject bulletPrefab;
     public Transform bulletSpawn;
     public double timeToMaxCharge;
     public float minCharge;
     public float maxCharge;
     public double cdAmount;
     private double timeStamp = 0; //cooldown
     private double chargeStart;
     private float charge;
     private bool onCd;
     public int parentIdShow;
     [SyncVar(hook = "CallbackSetOwner")]
     public NetworkInstanceId parentId;
     private WeaponControl weaponControl;
 
     // Use this for initialization
     void Start () {
         weaponControl = gameObject.transform.parent.gameObject.GetComponent<WeaponControl>();
         weaponControl.Switched(this);
         //gameObject.transform.position = gameObject.transform.parent.Find("GunPosition").transform.position;
     }
     [Command]
     public void CmdCharge()
     {
         if (timeStamp <= Time.time)
         {
             onCd = false;
         }
         chargeStart = Time.time;
     }
     [Command]
     public void CmdFire()
     {
         if (!onCd)
         {
             double chargeTime = Time.time - chargeStart;
             double chargePercent = chargeTime / timeToMaxCharge * 100;
             charge = (float)maxCharge / 100 * (float)chargePercent;
 
             if (charge > maxCharge)
             {
                 charge = maxCharge;
             }
             if (charge < minCharge)
             {
                 charge = minCharge;
             }
             Debug.Log(charge);
             // Create the Bullet from the Bullet Prefab
             var bullet = (GameObject)Instantiate(
                 bulletPrefab,
                 bulletSpawn.position,
                 bulletSpawn.rotation, gameObject.transform);
             // Add velocity to the bullet
             bullet.GetComponent<Rigidbody>().velocity = bullet.transform.forward * charge;
             timeStamp = Time.time + cdAmount;
             NetworkServer.Spawn(bullet);
         }
         onCd = true;
     }
 }
 ...