NullReferenceException help

Why do I get:

NullReferenceException: Object reference not set to an instance of an object

 using UnityEngine;
 using System.Collections;
 using TNet;
 
 public class SyncPlayerPosRot : TNBehaviour
 {
     private GameController gC;
 
     float mNextUpdate = 0f;
 
     // Use this for initialization
     void Start () 
     {
 
         gC = GetComponent<GameController>();
 
     }
     
     // Update is called once per frame
     void Update ()
     {
         if (mNextUpdate < Time.time)
         {
             mNextUpdate = Time.time + 0.01f;
             if (tno.isMine)
             {
                 gC.Player.Position = transform.position;
                 gC.Player.Rotation = transform.rotation;
 
                 tno.SendQuickly("SetPos", TNet.Target.OthersSaved, transform.position);
                 tno.SendQuickly("SetRot", TNet.Target.OthersSaved, transform.rotation);
             }
         }
     }
 
     [RFC] void SetPos (Vector3 pos) { transform.position = pos; }
     [RFC] void SetRot (Quaternion rot) { transform.rotation = rot; }
 }

Here is the GameController script->

 using UnityEngine;
 using System.Collections;
 
 public class GameController : MonoBehaviour 
 {
 
     public class PlayerSettings
     {
         public string Name;
         public int ID = 0;
         public string Team;
         public bool Spawned = false;
         public Vector3 Position;
         public Quaternion Rotation;
     }
     public PlayerSettings Player = new PlayerSettings();
 }