Unity3d HLAPI, Unet, network aware spawining - networking

Question

Hello I am trying to create my first game in unity which I wanna be network aware but I encoured a problem with network prefabs spawning. Here's my code:
using UnityEngine;
using System.Collections;
using UnityEngine.Networking;
public class Builder : NetworkBehaviour {
public GameObject preview;
public Transform currentPreview;
bool isPreviewing = false;
GameObject buildingPreview;
private NetworkIdentity networkId;
// Use this for initialization
void Start ()
{
networkId = GetComponent<NetworkIdentity>();
}
// Update is called once per frame
void ViewPreview()
{
buildingPreview = Instantiate(preview, transform.position, transform.rotation) as GameObject;
currentPreview = buildingPreview.transform;
isPreviewing = true;
}
void Update ()
{
CmdBuild();
}
void CmdBuild()
{
if (networkId.isLocalPlayer)
{
}
else
{ return; }
if (Input.GetKeyDown(KeyCode.E))
{
if (!isPreviewing)
ViewPreview();
else
{
Destroy(buildingPreview);
isPreviewing = false;
}
}
if (isPreviewing)
{
Preview();
}
}
[Command]
void CmdSpawnBuilding()
{
GameObject buildingPlaced = Instantiate(preview, currentPreview.position, currentPreview.rotation) as GameObject;
NetworkServer.Spawn(buildingPlaced);
}
void Preview()
{
currentPreview.position = transform.position + transform.forward * 3f;
currentPreview.rotation = transform.rotation;
if (Input.GetButtonDown("Fire1"))
{
CmdSpawnBuilding();
isPreviewing = false;
}
}
}
Compiler says there's no problem but in unity I've got such error: "UNetWeaver error: Script Builder uses [Command] CmdSpawnBuilding but is not a NetworkBehaviour. UnityEngine.Debug:LogError(Object)" My code runs perfetly good without "[Command]" line despites it's not network aware. Also, I know it's a bit messed up but I was trying to figure it out what's wrong and so yeah, messed code a bit.

Answer 1

Your class needs to inherit from NetworkBehaviour, like this:
public class Builder : NetworkBehaviour