Do not understand this "UnassignedReferenceException"

Unity Engine
1

I get the following message but do not understand why i get it.

myTransform is assigned:

3167761--241219--Skärmavbild 2017-08-01 kl. 16.34.55.png

Here is the code, which is attached to a button that i list multiple times in a ScrollView.

3167761--241220--Skärmavbild 2017-08-01 kl. 17.09.50.png
3167761--241220--Skärmavbild 2017-08-01 kl. 17.09.50.png474×678 46.2 KB

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Networking;

public class FriendsListItem : MonoBehaviour {

    private GameObject titleText;
    [SerializeField] private Text txt_BtnTitleName;
    [SerializeField] private Transform myTransform;
    private string[] friendsArray;
    private InputField inp_FinalIPaddress;
    private string myIPAddress;

    void Start () {
        titleText = GameObject.Find ("host_txt_Title");
        titleText.GetComponentInChildren<Text> ().text = "Peter";
        myTransform.GetComponent<Button>().onClick.AddListener(delegate { Btn_FriendsListButton(); });
        inp_FinalIPaddress = GameObject.Find ("inp_IP_Address").GetComponent<InputField> ();
        //print (Application.persistentDataPath + "/UNET_FriendsList.dtt");
    }

    public void Btn_FriendsListButton () {


        titleText.GetComponentInChildren<Text> ().text = txt_BtnTitleName.text;

    }

    void FindPlayersIPaddress () {
        // Open file and read everything in the file into array
        System.IO.StreamReader readFile = new System.IO.StreamReader (Application.persistentDataPath + "/UNET_FriendsList.dtt");
        friendsArray = System.IO.File.ReadAllLines (Application.persistentDataPath + "/UNET_FriendsList.dtt");
        readFile.Close ();

        bool didNotFind = true;

        // Find the IP address
        for (int i = 2; i < friendsArray.Length; i++) {

            if (txt_BtnTitleName.text == friendsArray [i]) {
                myIPAddress = friendsArray [i + 1];
                inp_FinalIPaddress.text = myIPAddress;
                didNotFind = false;
                break;
            }

        }

        if (didNotFind) {
            inp_FinalIPaddress.text = "No IP-address found";
        }

    }

}
2

First question: is “myTransform” just the transform of the object where the script is? If so, why not just use GetComponent<> directly? The transform reference is redundant.

Second question: You seem to have a lot of these objects; if even one of them is unassigned you’ll get that error. Try inserting a Debug.Log line with gameObject as the second parameter just before line 19 to see which object is throwing the error.

3

Assuming all your clones are assigned, make sure you don’t have an extra copy of the script somewhere in the scene.

Also, I’m a little confused on your start method.

First, friendly advice, I would not use GameObject.Find, it’s slow and you’re doing it for several objects. Better to have a manager type script that you can access the “host_txt_Title” and “inp_IP_Address” through.

Also, you now have several objects assigning the same text to the same object. Seems a bit odd to do that. (maybe you are just doing this for testing…)

@StarManta already posted about how to find the offending gameobject easier.

1 Like
4

Or better yet, just serialize the button in the inspector instead of the transform. Or better yet, just add the click event in the inspector in the first place…

1 Like
5

Thanks, forgot writing that this is pure testing. That is the reason why code looks like it does.

6

Well, i did find the problem, thank you for your comments. I had the code attached to the buttons but also to my Script_Container, which i did initially.

However, i did adjusted the code as well, before i will redesigning it completely and adjust to the new design i am working on:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Networking;

public class FriendsListItem : MonoBehaviour {

    [SerializeField] private Text txt_BtnTitleName;
    private string[] friendsArray;
    private string myIPAddress;
    private bool firstRun;
    private Color32 yellowColor = new Color32 (200, 200, 2, 255);

    public JoinDirectMatch _joinDirectMatch;

    void Start () {

        _joinDirectMatch = JoinDirectMatch.FindObjectOfType<JoinDirectMatch> ();
        _joinDirectMatch.go_btn_DeleteFriend.SetActive(false);

        firstRun = true;

    }

    public void Btn_FriendsListButton () {

        if (firstRun) {
            firstRun = false;
            _joinDirectMatch.txt_IPName.text = "";
            _joinDirectMatch.inp_IP_Address.text = "";
            gameObject.GetComponent<Image> ().color = yellowColor;
            _joinDirectMatch.go_btn_DeleteFriend.SetActive(true);

        } else {
            firstRun = true;
            _joinDirectMatch.txt_Title.text = txt_BtnTitleName.text;
            FindPlayersIPaddress ();
            gameObject.GetComponent<Image> ().color = Color.white;
            _joinDirectMatch.btn_JoinMatch.image.color = yellowColor;
            _joinDirectMatch.go_btn_DeleteFriend.SetActive(false);
        }

    }

    void FindPlayersIPaddress () {
        // Open file and read everything in the file into array
        System.IO.StreamReader readFile = new System.IO.StreamReader (Application.persistentDataPath + "/UNET_FriendsList.dtt");
        friendsArray = System.IO.File.ReadAllLines (Application.persistentDataPath + "/UNET_FriendsList.dtt");
        readFile.Close ();

        bool didNotFind = true;

        // Find the IP address
        for (int i = 2; i < friendsArray.Length; i++) {

            if (txt_BtnTitleName.text == friendsArray [i]) {
                _joinDirectMatch.txt_IPName.text = friendsArray [i];
                myIPAddress = friendsArray [i + 1];
                _joinDirectMatch.inp_IP_Address.text = myIPAddress;
                didNotFind = false;
                break;
            }

        }

        if (didNotFind) {
            _joinDirectMatch.inp_IP_Address.text = "No IP-address found";
        }

    }

}