Bug ArgumentNullException: Value cannot be null. Parameter name: _unity_self [Fixed]

Hi everybody, I made a 2d (URP) scene for Unity 2022.3.5f1 to make a simple prototype. But when I try to enter the victory trigger (pasted below) with my player I got the error: ArgumentNullException: Value cannot be null. Parameter name: _unity_self

How can Unity itself give a Null Exception? And how can I fix this?

Victory Trigger script:

Code (csharp):

1.  
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5. using UnityEngine.SceneManagement;
6.  
7. public class VictoryTrigger : MonoBehaviour
8. {
9.     private void OnTriggerEnter(Collider collider)
10.     {
11.         Debug.Log("Working");
12.         if (collider.CompareTag("Player"))
13.         {
14.             Debug.Log("Enter Code");
15.             SceneManager.LoadScene("MainMenu");
16.         }
17.     }
18. }
19.  
20.  

Before asking: Yes the player has the player tag, and yes there is a scene (in the build settings) with the name MainMenu. The debugs do not get written down.

Entire Error:
ArgumentNullException: Value cannot be null.
Parameter name: _unity_self
UnityEditor.SerializedObject.FindProperty (System.String propertyPath) (at <bf6080dbf0564cf1b405dfd6e0dac725>:0)
UnityEditor.UIElements.Bindings.SerializedObjectBindingContext.BindPropertyRelative (UnityEngine.UIElements.IBindable field, UnityEditor.SerializedProperty parentProperty) (at <68ddc6fd093848298397957a5969af5e>:0)
UnityEditor.UIElements.Bindings.SerializedObjectBindingContext.BindTree (UnityEngine.UIElements.VisualElement element, UnityEditor.SerializedProperty parentProperty) (at <68ddc6fd093848298397957a5969af5e>:0)
UnityEditor.UIElements.Bindings.SerializedObjectBindingContext.ContinueBinding (UnityEngine.UIElements.VisualElement element, UnityEditor.SerializedProperty parentProperty) (at <68ddc6fd093848298397957a5969af5e>:0)
UnityEditor.UIElements.Bindings.DefaultSerializedObjectBindingImplementation+BindingRequest.Bind (UnityEngine.UIElements.VisualElement element) (at <68ddc6fd093848298397957a5969af5e>:0)
UnityEngine.UIElements.VisualTreeBindingsUpdater.Update () (at <a053cdfb5a094ce2b5935515091f978f>:0)
UnityEngine.UIElements.VisualTreeUpdater.UpdateVisualTreePhase (UnityEngine.UIElements.VisualTreeUpdatePhase phase) (at <a053cdfb5a094ce2b5935515091f978f>:0)
UnityEngine.UIElements.Panel.UpdateBindings () (at <a053cdfb5a094ce2b5935515091f978f>:0)
UnityEngine.UIElements.UIElementsUtility.UnityEngine.UIElements.IUIElementsUtility.UpdateSchedulers () (at <a053cdfb5a094ce2b5935515091f978f>:0)
UnityEngine.UIElements.UIEventRegistration.UpdateSchedulers () (at <a053cdfb5a094ce2b5935515091f978f>:0)
UnityEditor.RetainedMode.UpdateSchedulers () (at <68ddc6fd093848298397957a5969af5e>:0)

I can also place down the 2d Movement Script I use, but I don't think that makes any difference.

Thanks for reading!

 

ArgumentNullException: Value cannot be null. Parameter name: _unity_self

 

Fixed!

-1 _Unity _Self Error: I put my entire project in a package and past them into another project. That project was a downgrade. I went from 2022.3.5f1 > 2021.3.28f. The error is fixed now!

-2 Victory trigger not working: It was a 2d scene, but I used a 3d OnTriggerEnter. Small mistake

 

Thank You