Question by Boardaic · Sep 16, 2017 at 12:28 PM · c#error array list

Get all Children of an Object with a certain component

I am making a card game and when the cards are dealt they are attached to my Player1 Gameobject (This GO also has other things than cards attached to it). What I want to do is to find all the cards on the player and add them to an Array/List (The Card Gameobject have a "Card" class attached to them. This is what I have tried to do:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class PlayerGetCards : MonoBehaviour {
 
     int x;
 
     List<GameObject> Children;
 
     TableMaster tMaster;
     PlayerMaster pMaster;
 
     string[] cards;
 
     public List<GameObject> slots;
 
     public void GetCards(bool durchgang)
     {
         pMaster = GetComponent<PlayerMaster>();
         tMaster = pMaster.table.GetComponent<TableMaster>();
         StartCoroutine(GetChildren(durchgang));
     }
 
     IEnumerator GetChildren(bool durchgang)
     {
         yield return new WaitForSeconds(1);
         if(!durchgang)
         {
             x = 0;
             foreach(Transform child in this.transform)
             {
                 if(child.GetComponent<Card>())
                 {                   
                     AddChildCard(child.name);
                     x++;
                 }
             }
         }
         else
         {
             x = 5;
             foreach(Transform child in this.transform)
             {
                 if (child.GetComponent<Card>())
                 {
                     AddChildCard(child.name);
                     x++;
                 }
             }
         }
     }
 
     void AddChildCard(string name)
     {
         cards.SetValue(name, x);
     }
 }

But for some Reason I get the following error two times:

NullReferenceException: Object reference not set to an instance of an object PlayerGetCards.AddChildCard (System.String name) (at Assets/Scripts/PlayerScripts/PlayerGetCards.cs:56) PlayerGetCards+c__Iterator0.MoveNext () (at Assets/Scripts/PlayerScripts/PlayerGetCards.cs:47) UnityEngine.SetupCoroutine.InvokeMoveNext (IEnumerator enumerator, IntPtr returnValueAddress) (at C:/buildslave/unity/build/Runtime/Export/Coroutines.cs:17)

Can someone tell me why this is happening and how I can fix it? Thanks in advance!

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