Null Reference Exception

Question

when i want creating i got Null alt text

 using UnityEngine;
 using System.Collections;
 using System;                //used for the Enum Class
 
 public class ChacaterGenerator : MonoBehaviour {
     private PlayerCharacter _toon;
     private const int STARTING_POINTS = 350;
     private const int MIN_STARTING_ATTRIBUTE_VALUE = 10;
     private const int STARTING_VALUE = 50;
     private int poinLeft;
     
     private const int OFFSET = 5;
     private const int LINE_HEIGHT = 20;
     
     private const int STAT_LABEL_WIDTH = 100;
     private const int BASEVALUE_LABEL_WIDTH = 30;
     private const int BUTTON_WIDTH = 20;
     private const int BUTTON_HEIGHT = 20;
     
     private int statStartingPos = 40;
     
     public GUIStyle myStyle;
     
     public GameObject playerPrefabs;
     
     // Use this for initialization
     void Start () {
         GameObject pc = Instantiate(playerPrefabs, Vector3.zero, Quaternion.identity) as GameObject;
         
         pc.name = "pc";
         
         _toon = pc.GetComponent<PlayerCharacter>();
 
         
         poinLeft = STARTING_POINTS;
         
         for(int cnt = 0; cnt < Enum.GetValues(typeof(AttributName)).Length; cnt++){
             _toon.GetPrimaryAttribute(cnt).BaseValue = STARTING_VALUE;
             poinLeft -= (STARTING_VALUE - MIN_STARTING_ATTRIBUTE_VALUE);
         }
         
         _toon.StatUpdate();        
     }
     
     void Update () {        
     }
     
     void OnGUI() {
         DisplayName();
         DisplayPointsleft();
         DisplayAttributes();
         DisplayVitals();
         DisplaySkills();
         
         if(_toon.Name == "" || poinLeft > 0 )
             DisplayCreateLabel();
         else
             DisplayCreateButton();
         
     }
     
     private void DisplayName() {
         GUI.Label(new Rect(10, 10, 50, 25), "Name:");
         _toon.Name = GUI.TextField(new Rect(65, 10, 100, 25), _toon.Name);
     }
     
     private void DisplayAttributes() {
         for(int cnt = 0; cnt < Enum.GetValues(typeof(AttributName)).Length; cnt++){
             GUI.Label(new Rect( OFFSET,
                                 statStartingPos + (cnt * LINE_HEIGHT),
                                 STAT_LABEL_WIDTH, 
                                 LINE_HEIGHT
                     ), ((AttributName)cnt).ToString());
             
             GUI.Label(new Rect( STAT_LABEL_WIDTH + OFFSET, 
                                 statStartingPos + (cnt * LINE_HEIGHT), 
                                 BASEVALUE_LABEL_WIDTH, 
                                 LINE_HEIGHT
                     ), _toon.GetPrimaryAttribute(cnt).AdjustedBaseValue.ToString());
             
             if(GUI.Button(new Rect( OFFSET + STAT_LABEL_WIDTH + BASEVALUE_LABEL_WIDTH, 
                                     statStartingPos + (cnt * BUTTON_HEIGHT), 
                                     BUTTON_WIDTH, 
                                     BUTTON_HEIGHT
                         ), "-")){
                 if(_toon.GetPrimaryAttribute(cnt).BaseValue > MIN_STARTING_ATTRIBUTE_VALUE){
                     _toon.GetPrimaryAttribute(cnt).BaseValue--;
                     poinLeft++;
                     _toon.StatUpdate();
                 }
             }
             if(GUI.Button(new Rect( OFFSET + STAT_LABEL_WIDTH + BASEVALUE_LABEL_WIDTH + BUTTON_WIDTH, 
                                     statStartingPos + (cnt * BUTTON_HEIGHT), 
                                     BUTTON_WIDTH, 
                                     BUTTON_HEIGHT
                             ), "+")){
                 
                 if(poinLeft > 0) {
                     _toon.GetPrimaryAttribute(cnt).BaseValue++;
                     poinLeft--;
                     _toon.StatUpdate();
                 }
             }
         }
     }
     
     private void DisplayVitals() {
         for(int cnt = 0; cnt < Enum.GetValues(typeof(VitalName)).Length; cnt++) {
             GUI.Label(new Rect( OFFSET, 
                                 statStartingPos + ((cnt +7) * LINE_HEIGHT), 
                                 STAT_LABEL_WIDTH, 
                                 LINE_HEIGHT
                     ), ((VitalName)cnt).ToString());
             
             GUI.Label(new Rect( OFFSET + STAT_LABEL_WIDTH, 
                                 statStartingPos + ((cnt +7) * LINE_HEIGHT), 
                                 BASEVALUE_LABEL_WIDTH, LINE_HEIGHT
                     ), _toon.GetVital(cnt).AdjustedBaseValue.ToString());
         }
     }
     
     private void DisplaySkills() {
         for(int cnt = 0; cnt < Enum.GetValues(typeof(SkillName)).Length; cnt++) {
             GUI.Label(new Rect( OFFSET + STAT_LABEL_WIDTH + BASEVALUE_LABEL_WIDTH + BUTTON_WIDTH * 2 + OFFSET * 2 , 
                                 statStartingPos + (cnt * LINE_HEIGHT), 
                                 STAT_LABEL_WIDTH, 
                                 LINE_HEIGHT
                     ), ((SkillName)cnt).ToString());
             
             GUI.Label(new Rect( OFFSET + STAT_LABEL_WIDTH + BASEVALUE_LABEL_WIDTH + BUTTON_WIDTH * 2 + OFFSET * 2 + STAT_LABEL_WIDTH, 
                                 statStartingPos + (cnt * LINE_HEIGHT), 
                                 BASEVALUE_LABEL_WIDTH, 
                                 LINE_HEIGHT
                                 ), _toon.GetSkill(cnt).AdjustedBaseValue.ToString());
         }
     }
     
     private void DisplayPointsleft() {
         GUI.Label(new Rect(250, 10, 100, 25), "Points Left: " + poinLeft.ToString());
     }
     private void DisplayCreateLabel() {
         GUI.Label(new Rect( Screen.width/ 2 - 50, statStartingPos + (10 * LINE_HEIGHT), 100, LINE_HEIGHT), "Creating...", "Button");
     }
 
     
     private void DisplayCreateButton() {
         if(GUI.Button(new Rect( Screen.width/ 2 - 50, statStartingPos + (10 * LINE_HEIGHT), 100, LINE_HEIGHT), "Create")) {
             GameSettings gsScript = GameObject.Find("_ _GameSettings").GetComponent<GameSettings>();
                 
             //change the cur value of the vitals to the max modified value of that vital
             UpdateCurVitalValues();
             
             //save the character data
             gsScript.SaveCharacterData();
             
             Application.LoadLevel(1);
         }
     }    
     private void UpdateCurVitalValues(){
         for(int cnt = 0; cnt < Enum.GetValues(typeof(VitalName)).Length; cnt++){
             _toon.GetVital(cnt).CurValue = _toon.GetVital(cnt).AdjustedBaseValue;
         }
     }
 }

Answer 1

Answer by Jamster · Nov 04, 2013 at 06:18 PM

Short answer is that it either can't find the "_ _GameSettings" object or the object doesn't have a GameSettings script on it.

Try changing:

      GameSettings gsScript = GameObject.Find("_ _GameSettings").GetComponent<GameSettings>();

to:

          GameObject gsObject = GameObject.Find("_ _GameSettings");
          if( !gsObject ){
              Debug.LogError("No Object called _ _GameSettings!");
              return;
          }

          GameSettings gsScript = gsObject.GetComponent<GameSettings>();
          if( !gsScript ){
              Debug.LogError("No GameSettings script on _ _GameSettings object!");
              return;
          }

And that should give you a bit of info on where your problem lies.

If your problem is that there is not _ GameSettings object try changing the name of the _GameSettings object to just _GameSettings in case unity doesn't like it.

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ekahacksign_ · Nov 04, 2013 at 06:57 PM 0

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im try change with you script, but i got message like this

No Object called _ _GameSettings! UnityEngine.Debug:LogError(Object) ChacaterGenerator:DisplayCreateButton() (at Assets/Scripts/Character Classes/ChacaterGenerator.cs:150) ChacaterGenerator:OnGUI() (at Assets/Scripts/Character Classes/ChacaterGenerator.cs:58)

ekahacksign_ · Nov 04, 2013 at 07:02 PM 0

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i change

 GameObject gsObject = GameObject.Find("_ _GameSettings");

to

 GameObject gsObject = GameObject.Find("_GameSettings");

i got same message No Object called _ _GameSettings! UnityEngine.Debug:LogError(Object) ChacaterGenerator:DisplayCreateButton() (at Assets/Scripts/Character Classes/ChacaterGenerator.cs:150) ChacaterGenerator:OnGUI() (at Assets/Scripts/Character Classes/ChacaterGenerator.cs:58)

Jamster · Nov 04, 2013 at 11:05 PM 0

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In that case double check that:

Your GameObject exists The name of
The GameObject is correct The name in
Your script is correct

And it should work :)

If all else fails make a variable and put the gameobject in that! :P

Null Reference Exception

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