title: NetworkServer is not active. Cannot spawn objects without an active server in Unity 3D
body: <p>I am trying to implement a multiplayer feature in Unity3d. Its like a snake game, snake eats food and generate its part. I can successfully generate food and part as well but its not moving and giving me error "NetworkServer is not active. Cannot spawn objects without an active server." </p>
  
  <p>Here is my code :-</p>
  
  <pre><code>  private void CmdCheckForFood(Vector3 snakePartPosToBeInitialize,Vector3 headPos)
  {
  
      if(_food != null)
      {
          if (_food.transform.position == headPos) // if food collide with head. 
          {
              _food.transform.position = GenerateRandomPosForFood(); 
                 currPartOfSnake += 1;
              CmdCreatePartSnake(snakePartPosToBeInitialize);
  
  
          }
      }
  
  }
  public void CreatePartSnake(Vector3 snakePartPosToBeInitialize)
  {
      GameObject obj = Instantiate(snakePart, snakePartPosToBeInitialize, Quaternion.identity) as GameObject;
  
      obj.name = "" + currPartOfSnake;
      obj.transform.parent = gameObject.transform;
      tail.Add(obj); // tail is list which contain all part of snake
      NetworkServer.Spawn(obj);
  }
  </code></pre>