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

Question

MenuNetwork.SpawnMyPlayer() (at Assests\scripts\MenuNetwork.cs:34

 using UnityEngine;
 using System.Collections;
 
 public class MenuNetwork : Photon.MonoBehaviour {
 
     public GameObject spawnPos;
     public GameObject _StandbyCamera;
 
     void Start () {
         PhotonNetwork.ConnectUsingSettings("0.1");
     }
 
     void OnGUI () {
         GUILayout.Label(PhotonNetwork.connectionStateDetailed.ToString());
     }
 
     void OnJoinedLobby() {
         PhotonNetwork.JoinRandomRoom();
     }
 
     void OnPhotonRandomJoinFailed() {
         PhotonNetwork.CreateRoom(null);
     }
 
     void OnJoinedRoom() {
         Debug.Log ("Connected to Room");
         SpawnMyPlayer();
     }
 
     void SpawnMyPlayer() {
         GameObject myPlayerGO = (GameObject)PhotonNetwork.Instantiate("Player", spawnPos.transform.position, spawnPos.transform.rotation, 0);
         _StandbyCamera.SetActive(false);
 
         ((MonoBehaviour)myPlayerGO.GetComponent("MouseLook")).enabled = true;
         ((MonoBehaviour)myPlayerGO.GetComponent("CharacterMotor")).enabled = true;
         ((MonoBehaviour)myPlayerGO.GetComponent("PlayerGUI")).enabled = true;
 
         myPlayerGO.transform.FindChild("Main Camera").gameObject.SetActive(true);
     }
 }

Answer 1

Answer by komodor · Jul 08, 2015 at 11:17 AM

so it's this line:

 ((MonoBehaviour)myPlayerGO.GetComponent("MouseLook")).enabled = true;

i'd say it's the MonoBehaviour casting, just remove (MonoBehaviour)

if the problem persists then you miss MouseLook component on myPlayerGO

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Thomas-Mountainborn · Jul 08, 2015 at 11:21 AM 0

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If the casting would be the issue, there would be a cast exception. Only is he used the "as" keyword and it returned null (object as $$anonymous$$onoBehaviour), the casting could be the cause in this case.

http://stackoverflow.com/questions/132445/direct-casting-vs-as-operator

RainKiller27 · Jul 08, 2015 at 05:00 PM 0

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Yeah it doesn't seem to work, no matter what I do I tired everything you said but still getting the error when I load the game first player works fine but when the second joins they are both the same player and just glitches out?

RainKiller27 · Jul 08, 2015 at 05:05 PM 0

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yeah must of been the monobehaviour i'll have to rewrite them lines and find a different way of doing the same thing thanks for the help.

Answer 2

Answer by Thomas-Mountainborn · Jul 08, 2015 at 11:20 AM

If GetComponent returns null, as it does in your case, it means the desired component isn't attached to your game object.

Also, just as a general tip, you really really really shouldn't use strings to do GetComponent. Instead, use the generic syntax:

 GetComponent<MouseLook>()

, or alternatively GetComponent(typeof(MouseLook)). That way, if you change the name of the class, these names will be updated automatically. They won't change in your string based approach, which will in turn lead to null reference exceptions because the desired type could not be found on the game object, because it does not exist.

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RainKiller27 · Jul 08, 2015 at 05:00 PM 0

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Yeah it doesn't seem to work, no matter what I do I tired everything you said but still getting the error when I load the game first player works fine but when the second joins they are both the same player and just glitches out?

RainKiller27 · Jul 08, 2015 at 05:05 PM 0

Share

yeah must of been the monobehaviour i'll have to rewrite them lines and find a different way of doing the same thing thanks for the help.

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

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