Question Adding a Custom Package Using a Script to a Project

Here is a script with a link to a custom package but it doesn't want to be added to the project. What is the problem ?

Code (CSharp):

1. using UnityEditor;
2. using UnityEditor.PackageManager.Requests;
3. using UnityEditor.PackageManager;
4. using UnityEngine;
5.  
6. namespace Unity.Editor.Example
7. {
8.     [InitializeOnLoad]
9.     static class AddLibrary
10.     {
11.         static AddRequest Request;
12.  
13.         [MenuItem("Window/Add Library")]
14.         static void Add()
15.         {
16.             // Add a package to the project
17.             Request = Client.Add("file:\\C:\\Users\\111\\Desktop\\com.prorok.testpack");
18.             EditorApplication.update += Progress;
19.         }
20.  
21.         static void Progress()
22.         {
23.             if (Request.IsCompleted)
24.             {
25.                 if (Request.Status == StatusCode.Success)
26.                     Debug.Log("Installed: " + Request.Result.packageId);
27.                 else if (Request.Status >= StatusCode.Failure)
28.                     Debug.Log(Request.Error.message);
29.  
30.                 EditorApplication.update -= Progress;
31.             }
32.         }
33.     }
34. }

 

Thanks