What is unity problem?

Unity Engine
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NullReferenceException: Object reference not set to an instance of an object
UnityEditor.PropertyHandler.IsArrayReorderable (UnityEditor.SerializedProperty property) (at <0c3742f371b24679bcaa6fcc508d0cca>:0)
UnityEditor.PropertyHandler.UseReorderabelListControl (UnityEditor.SerializedProperty property) (at <0c3742f371b24679bcaa6fcc508d0cca>:0)
UnityEditor.PropertyHandler.GetHeight (UnityEditor.SerializedProperty property, UnityEngine.GUIContent label, System.Boolean includeChildren) (at <0c3742f371b24679bcaa6fcc508d0cca>:0)
UnityEditor.EditorGUI.GetPropertyHeightInternal (UnityEditor.SerializedProperty property, UnityEngine.GUIContent label, System.Boolean includeChildren) (at <0c3742f371b24679bcaa6fcc508d0cca>:0)
UnityEditor.EditorGUI.GetPropertyHeight (UnityEditor.SerializedProperty property, UnityEngine.GUIContent label, System.Boolean includeChildren) (at <0c3742f371b24679bcaa6fcc508d0cca>:0)
UnityEditor.Editor.CanBeExpandedViaAFoldoutWithoutUpdate () (at <0c3742f371b24679bcaa6fcc508d0cca>:0)
UnityEditor.UIElements.EditorElement.UpdateInspectorVisibility () (at <0fdaf67e8e744beea25e77915c19f81b>:0)
UnityEditor.UIElements.EditorElement.Init () (at <0fdaf67e8e744beea25e77915c19f81b>:0)
UnityEditor.UIElements.EditorElement…ctor (System.Int32 editorIndex, UnityEditor.IPropertyView iw, System.Boolean isCulled) (at <0fdaf67e8e744beea25e77915c19f81b>:0)
UnityEditor.EditorUIServiceImpl.CreateEditorElement (System.Int32 editorIndex, UnityEditor.IPropertyView iw, System.String title) (at <80d791e9b1714d8c9c1d90aef484ea86>:0)
UnityEditor.PropertyEditor.DrawEditors (UnityEditor.Editor[ ] editors) (at <0c3742f371b24679bcaa6fcc508d0cca>:0)
UnityEditor.PropertyEditor.RebuildContentsContainers () (at <0c3742f371b24679bcaa6fcc508d0cca>:0)
UnityEditor.InspectorWindow.RedrawFromNative () (at <0c3742f371b24679bcaa6fcc508d0cca>:0)

I made 2D tilemap then this started popping

2

Object reference not set to an instance of an object

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I understood that but unity didnt say in which script or object his talking about. even if I clicked the Error

4

How to fix a NullReferenceException error

https://forum.unity.com/threads/how-to-fix-a-nullreferenceexception-error.1230297/

Three steps to success:

  • Identify what is null ← any other action taken before this step is WASTED TIME
  • Identify why it is null
  • Fix that