How to Fix this issue

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 using UnityEngine;
 using UnityEngine.UI;
 using System.Collections.Generic;
 
 public class ObjectiveList : MonoBehaviour {
     
     public ObjectiveList obj;
     public Text objList;
     public List<Objective> objectives = new List<Objective>();
 
     void Start() {
         obj = FindObjectOfType<ObjectiveList>();
         obj.CreateObjective ("obj1", "Enter the palace.");
     }        
 
     void OnTriggerEnter(Collider other)
     {
         if (other.tag == "Player") {
             obj.CompleteObjective ("Obj1");
         }
     }
 
     void Update()
     {
         objList.text = "";
 
         Objective[] objArray = objectives.ToArray();
 
         for (int i=0; i < objectives.Count; i++)
         {
             Objective test = objectives[i];
 
             if(!test.completed)
                 objList.text += (i+1)+ "." + objArray[i].objective + "\n";
             else
                 objList.text += (i + 1) + ".<b><color=green>" + objArray[i].objective + "</color></b>\n";
         }
     }
 
     public void CreateObjective(string shortName, string objText)
     {
         objectives.Add(new Objective(shortName, objText, false));
         objectives.Sort();
     }
 
     public void CompleteObjective(string objName)
     {
         Objective selected = objectives.Find(x => x.identifier.Contains(objName));
         selected.completed = true;
     }
 
     public void RemoveObjective(string objName)
     {
         objectives.Remove(objectives.Find(x => x.identifier.Contains(objName)));
     }
 }

NullReferenceException: Object reference not set to an instance on an object ObjectiveList.Update () (at Assets/ASCore/Scripts/ObjectiveList.cs:25

Answer 1

Best Answer

Answer by TBruce · May 22, 2016 at 02:37 AM

When posting code, please do not post screen shots. People can not help much that way. Please format ALL you code properly and paste the code directly into the body of the question. To do that copy the code to your clipboard and press the "101010" button in the toolbar of the UA text editor. This will format the code so it can be easily read in the forum.

But I would say your problem is that

 public text objList;

has not been set in the inspector and therefore is null. so when you go to use is you will get a NullReferenceException error.

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GJMartinez · May 22, 2016 at 03:32 AM 0

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@$$anonymous$$avina How can I set it into the inspector to fix this problem?

TBruce GJMartinez · May 22, 2016 at 04:03 AM 0

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You need to create a UI Text object in the hierarchy like seen in this link. Then drag the UI Text object to the Text field as seen in this link.

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