Question by shrutiturner · May 08, 2018 at 12:21 PM · c#xml

XML file data won't load - am I using the function incorrectly?

I'm trying to read in an xml file so that I can use the data within in my application.
I get the following error when I run my code: NullReferenceException: Object reference not set to an instance of an object levelHandler.LoadLevel (Int32 nr) (at Assets/Scripts/levelHandler.cs:41) turnManager.Start () (at Assets/Scripts/turnManager.cs:26)
I have tried to debug the code, and from what I gather, and the error is because I have a null array, therefore the "levString" line will not work.
Please could you tell me what I'm doing wrong?

 using System.Collections;
 using System.Collections.Generic;
 using System.Xml;
 using UnityEngine;
 
 public class levelHandler : MonoBehaviour
 {
     XmlDocument levelDoc;
     XmlNodeList levelList;
     List<string> levelArray;
 
     // Use this for initialization
     void Start()
     {
         levelArray = new List<string>();
         levelDoc = new XmlDocument();
 
         TextAsset xmlFile = Resources.Load("levels", typeof(TextAsset)) as TextAsset;
         levelDoc.LoadXml(xmlFile.text);
         levelList = levelDoc.GetElementsByTagName("level");
         
         foreach(XmlNode levelData in levelList)
         {
             XmlNodeList levelInfo = levelData.ChildNodes;
 
             foreach(XmlNode data in levelInfo)
             {
                 if(data.Name == "setup")
                 {
                     levelArray.Add(data.InnerText);
                 }
             }
         }
     }
 
     public void LoadLevel(int nr)
     {
         string[] levString = levelArray[nr - 1].Split(',');
 
         foreach(string brick in levString)
         {
             GameObject.Find(brick).GetComponent<lightSwitch>().change();
         }
     }
 
     // Update is called once per frame
     void Update ()
     {
         
     }
 }

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