Invalid index 433 (size is zd) + ArgumentException: Getting control x's position in a group with only x controls when doing Repaint

Questions & Answers
1

Hello.

I have a very strange problem and I’m not able to fix it.
I have a ScriptableObject with a member of a custom class with a custom propertydrawer.
I create an asset for this ScriptableObject. If I click on this asset in the editor to modify some values I get this error:

Invalid index 433 (size is zd) UnityEditor.DockArea:OnGUI()
and this:
ArgumentException: Getting control 4’s position in a group with only 4 controls when doing Repaint Aborting

The error vanishes when I remove the member with the custom propertydrawer but of course it is no solution to remove it :).

So I stripped down my code to the absolute basics for debugging purpose but the errors remain and I don’t have the slightest idea how to solve them.

This is my stripped down code:
The ScriptableObject:

        using UnityEngine;
        using System.Collections;
        using System.Collections.Generic;
        
        public class Cart : ScriptableObject 
        {
        	public LocalizedString localizedCartName; // the errors vanish if I remove this
        	public Sprite 	cartImage;
        	public bool		isUnlocked;
        }

LocalizedString:

using UnityEngine;
using System.Collections;

[System.Serializable]
public class LocalizedString 
{
	public string key;

	public string GetLocalizedString()
	{
		//return SmartLocalization.LanguageManager.Instance.GetTextValue(key);
		return string.Empty;
	}
}

its propertydrawer:

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using UnityEditor;
using UnityEditorInternal;

[CustomPropertyDrawer(typeof(LocalizedString))]
public class LocalizedStringEditor : PropertyDrawer
{
	public override float GetPropertyHeight (SerializedProperty property, GUIContent label) 
	{
		return 5.0f;
	}

	public override void OnGUI(Rect position, SerializedProperty property, GUIContent label) 
	{
              EditorGUI.indentLevel++;
              EditorGUILayout.LabelField("en", "bla");
              EditorGUI.indentLevel--;
    }
 }

This is it. Any idea what is going wrong here?

Edit:
I figured out that the problem is using EditorGUILayout.
Everytime I use it I get these errors. When I switch to EditorGUI it works like a charm.
But why is this. I’d like to use EditorGUILayout as it is far easier to use,

2

I solved this issue.
This seems to be a bug or a ‘problem’ with unity.

I created a custom Editor for my SerializeableObject which is doing nothing:

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using UnityEditor;
using UnityEditorInternal;

[CustomEditor(typeof(Cart))]
public class CartEditor : Editor
{

}

But it solved the problem and the code is running fine now.
This post led me in the right direction:

http://answers.unity3d.com/questions/661360/finally-a-solution-cant-use-guilayout-stuff-in-pro.html