Ошибка cs0246 unity

FIX FOR ALL UNITY VERSIONS
So, this is how I fixed this problem after multiple failed attempts and bad advice from a countless number of people who think they know how computers work.
This issue is caused by, loading in old projects, altering visual studio, switching from computer, using different Unity versions, updating Unity, bad file management and a few other causes which I couldn’t care to put down here.
Non of the steps below are extreme, they are all but necessary.So lets fix your project mate, so you don’t have to sweat like I did, which I did a lot ahaha =P
— Making sure your Unity software is closed during the fix:

1. DO NOT START UP UNITY

2. MAKE SURE UNITY HUB AND OTHER UNITY PROGRAMS ARE CLOSED (Via both taskbar icon & task manager, Unity will resolve the packages if it is opened, so make sure it is closed)
   — Deleting the first problem:

3. Go to C:UsersUSERNAMEAppDataLocalUnitycachepackagespackages.unity.com

4. Delete ALL the folders inside «packages.unity.com»
   — Deleting the second problem:

5. Go to your project folder, so your game folder, in my case it is saved in the USER folder which is named after your computer’s username, so for me it is «C:UsersUSERNAMEYOUR PROJECTLibraryPackageCache»

6. Delete ALL the folders inside the «PackageCache»
   — Deleting the third and final problem:

7. Go to C:UsersUSERNAMEYOUR PROJECTPackages

8. Delete BOTH manifest.json & packages-lock.json (These hold the packages list and versions, packages with versions will be resolved/updated when unity is open or launched)

9. Start up your Unity editor and… hopefully your console will be empty.
   * Note that the USERNAME is the directory paths needs to be replaced with YOUR computer username
   ** YOUR PROJECT is a place holder for the name of your project
   *** The appdata directory can easily be found by entering %appdata% in the windows search bar on the bottom left of your display
   I want to state in these last lines how bad Unity is designed and how careless the developers are towards their consumers, this is a terrible service to subscribe to, liability wise.This bug bothers an enormous majority of their user base and is completely ignored.
   For a company that tries to make game making easy, they are making it awfully hard on people who are trying to create their dreams with THEIR software.

I have two scripts, one is located at:

Assets / Scriptable Objects / …

while the other one is located at:

Assets / Scripts / …

I have the first script encapsulated on a namespace.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
using VoidlessNodes.LevelFlowNodes;

namespace VoidlessUtilities
{
[CreateAssetMenu]
public class LevelFlowData : BaseNodeEditorData<BaseLevelNode, LevelFlowEditorAttributes>
{
    private const string MENU_ITEM_PATH = "Create / ScriptableObjects / LevelFlowData";
    private const string NEW_ASSET_PATH = "ScriptableObjects / Level Flow Data";

    [SerializeField] private string _name;
    private RootLevelNode _root;

    /// <summary>Gets and Sets name property.</summary>
    public string name
    {
        get { return _name; }
        set { _name = value; }
    }

    /// <summary>Gets and Sets root property.</summary>
    public RootLevelNode root
    {
        get { return _root; }
        set { _root = value; }
    }

    [MenuItem(MENU_ITEM_PATH)]
    public static void CreateAsset()
    {
        LevelFlowData scriptableObject = ScriptableObject.CreateInstance<LevelFlowData>() as LevelFlowData;
        AssetDatabase.CreateAsset(scriptableObject, AssetDatabase.GenerateUniqueAssetPath(NEW_ASSET_PATH));
    }

    public BaseLevelFlowNode GetLevelFlow()
    {
        BaseLevelFlowNode rootLevelFlow = null;

        if(root != null)
        {
            rootLevelFlow = root.GetNode();
        }
        else
        {
            Debug.LogError("[LevelFlowData] Data has no RootLevelFlowNode saved");
        }

        return rootLevelFlow as RootLevelFlowNode;
    }
}
}

And the other one is using the same namespace, which is a namespace I use for my custom scripts, but the only difference is that LevelFlowData’s location is not under Scripts.

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using VoidlessUtilities;

public class TestLevelController : Singleton<TestLevelController>
{
    [SerializeField] private LevelFlowData _levelFlowData;
    [SerializeField] private List<GameObject> _testViews;

    /// <summary>Gets and Sets levelFlowData property.</summary>
    public LevelFlowData levelFlowData
    {
        get { return _levelFlowData; }
        protected set { _levelFlowData = value; }
    }

    /// <summary>Gets and Sets testViews property.</summary>
    public List<GameObject> testViews
    {
        get { return _testViews; }
        set { _testViews = value; }
    }

#region UnityMethods:
    void OnEnable()
    {
        BaseInteractable.onTriggeredEvent += (int _eventID, bool _triggered)=> { Debug.Log("[TestLevelController] Event Triggered: " + _eventID); };
    }

    void OnDisable()
    {
        BaseInteractable.onTriggeredEvent -= (int _eventID, bool _triggered)=> { Debug.Log("[TestLevelController] Event Triggered: " + _eventID); };
    }

    /// <summary>TestLevelController's' instance initialization.</summary>
    void Awake()
    {

    }

    /// <summary>TestLevelController's starting actions before 1st Update frame.</summary>
    void Start ()
    {

    }

    /// <summary>TestLevelController's tick at each frame.</summary>
    void Update ()
    {

    }
#endregion

#region PublicMethods:
    public void EnableView(int _index)
    {
        testViews.SetAllActive(false);
        testViews[_index].SetActive(true);
    }
#endregion

#region PrivateMethods:

#endregion
}

Do I need to move LevelFlowData to Scripts, and make platform independet compilation (e.g., #if UNITY_EDITOR) encapsulation for UnityEditor namespace usage? Or is there another point I am missing?

This is the specific error log:

Assets/Scripts/Scene Controllers/TestLevelController.cs(10,27): error CS0246: The type or namespace name `LevelFlowData’ could not be found. Are you missing an assembly reference?

Thanks in advance.

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