Calling Command Function from Client results in "NetworkServer not active..."

Question

Hey!

I have an issue when executing a command from a client. I want to spawn an object using the following code:

 [Command]
     public void CmdHandleTap()
     {
         GameObject instance = Instantiate(projectilePrefab, transform.Find("ProjectileSpawn"));
         instance.GetComponent<Rigidbody>().AddForce(transform.forward * 1000 * instance.GetComponent<Projectile>().speed);
         NetworkServer.Spawn(instance);
     }

However I get the following error when NetworkServer.Spawn(...) is called:

SpawnObject for Projectiles(Clone) (UnityEngine.GameObject), NetworkServer is not active. Cannot spawn objects without an active server. UnityEngine.Networking.NetworkServer:Spawn(GameObject) PlaneController:CmdHandleTap() (at Assets/Scripts/GameObjects/PlaneController.cs:82)

The following things I consider noteworthy:

I can spawn a projectile if using a host but only on the host client.
Projectile has a NetworkIdentity and a NetworkTransform Component attached.
The problem persists for different clients on the same machine as well as different clients on different machines
I have been following the UNET tutorial on the official website and spawning objects there was working... I don't find a difference to what I am doing though.
I'm using an Interface to access the command functions.

Bottom Line: For some reason I cannot spawn prefabs in a Command Function when called from a client. Can anyone see what I am missing here?

Note: I have noticed the same question being asked a few times already, eg. here. However I have not found an answer yet. Maybe someone can help by now?

Answer 1

Best Answer

Answer by schoschi · Nov 28, 2017 at 10:07 PM

I managed to solve the issue. My problem was that I tried to access command methods through an interface.

2 possible solutions:

Remove the interface
do a two step implementation of the interface methods like this:

Code:

 public interface IController
 {
     void HandleTap();
 }
 
 public class MyController : NetworkBehaviour, IController
 
 {  
     //This will still be executed by the client
     public void HandleTap()
     {
         CmdHandleTap();
     }
 
     [Command]
     private void CmdHandleTap()
     {
         //Code from above
     }
 }

I hope this might help people looking for a similar answer in the future!

Add comment · Share

Calling Command Function from Client results in "NetworkServer not active..."

1 Reply

Your answer

Follow this Question

Related Questions