Reddit.Exceptions.RedditForbiddenException: 'Reddit API returned Forbidden (403) response.'

[JanssonTheBest]

I'm using the right AppID, as well as the correct secret code, but still, I get this

Reddit.Exceptions.RedditForbiddenException: 'Reddit API returned Forbidden (403) response.'

I'm trying to access posts on a subreddit.

the code:

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Http;
using Reddit;
using Reddit.Controllers;
using Reddit.Things;

namespace CashCowByJansson
{
public class RedditStorieScrapper
{
public string Seceret { get; set; }
public string AppID { get; set; }
public string Storries { get; set; }
public string Story { get; set; }
public RedditStorieScrapper(string seceret, string appID)
{
Storries = File.ReadAllText("..\..\Buffer\StoriesHistory.txt");
Seceret = seceret;
AppID = appID;
Story = RetrievePost();
}

    public string RetrievePost()
    {
        RedditClient redditClient = new RedditClient(appId: AppID, appSecret: Seceret);
        var subReddit = redditClient.Subreddit("nosleep");
        List<Reddit.Controllers.Post> posts = subReddit.Posts.GetHot(limit: 100).ToList();

        foreach (var post in posts)
        {
            if (!Storries.Contains(post.ToString()))
            {
                return post.ToString();
            }
        }
        return "";
    }


}

}