Bug Unity does not recognize the "Application.dataPath" as a project location and the directory is fine

I just wanted to script-create assets, so I figured I should use "AssetDatabase.CreateAsset(example, path);" but I got the error "Couldn't create asset file! (lots of error code)".
But now for some reason the error has changed, until then I had only changed the code that I show below:

Code (CSharp):

1. using UnityEngine;
2. using System.IO;
3. using UnityEditor;
4.  
5. public class MusicasFinderAndAjuster : MonoBehaviour
6. {
7.     string BasePath;
8.     private void Start()
9.     {
10.     }
11.     private void Update()
12.     {
13.         if (Input.GetKeyDown(KeyCode.Alpha3))
14.         {
15.             print(AssetDatabase.IsValidFolder(Application.dataPath));
16.             print(AssetDatabase.IsValidFolder(Application.dataPath+"/Assets"));
17.             scriptableExemple example = ScriptableObject.CreateInstance<scriptableExemple>();
18.             // path has to start at "Assets"
19.             string path = System.IO.Directory.GetCurrentDirectory() + "/a.asset";
20.             //path.Remove()
21.             Debug.LogWarning(path);
22.             GUIUtility.systemCopyBuffer = System.IO.Directory.GetCurrentDirectory();
23.             AssetDatabase.CreateAsset(example, path);
24.         }
25.     }
26. }
27.  

But now unity simply tells me that the "Application.dataPath" path is not a valid path for this function, or something like that.
I searched a lot and I was led to understand that maybe the project is not recognizing the place where it is and I should tinker with the "Version Controler" or "External Tools", but it doesn't solve anything and I can't actually do anything.
Here are some photos of errors and other things: