Youtube Video Retrieve problem

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Google.GData.Client;
using Google.GData.Extensions;
using Google.GData.YouTube;
using Google.GData.Extensions.MediaRss;
using Google.YouTube;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            YouTubeRequestSettings settings = new YouTubeRequestSettings("PrivateTool", "Mein Developer Key", "Username", "PW");
            YouTubeRequest request = new YouTubeRequest(settings);
            string videoId = "f9CZgT3sN68";
            Uri videoEntryUrl = new Uri("http://gdata.youtube.com/feeds/api/videos/" + videoId);
            Video video = request.Retrieve<Video>(videoEntryUrl); //<- Makierte Stelle :D
            printVideoEntry(video);
            Console.ReadLine();
        }
        static void printVideoEntry(Video video)
        {
            Console.WriteLine("Title: " + video.Title);
            Console.WriteLine(video.Description);
            Console.WriteLine("Keywords: " + video.Keywords);
            Console.WriteLine("Uploaded by: " + video.Uploader);
            if (video.YouTubeEntry.Location != null)
            {
                Console.WriteLine("Latitude: " + video.YouTubeEntry.Location.Latitude);
                Console.WriteLine("Longitude: " + video.YouTubeEntry.Location.Longitude);
            }
            if (video.Media != null && video.Media.Rating != null)
            {
                Console.WriteLine("Restricted in: " + video.Media.Rating.Country);
            }

            if (video.IsDraft)
            {
                Console.WriteLine("Video is not live.");
                string stateName = video.Status.Name;
                if (stateName == "processing")
                {
                    Console.WriteLine("Video is still being processed.");
                }
                else if (stateName == "rejected")
                {
                    Console.Write("Video has been rejected because: ");
                    Console.WriteLine(video.Status.Value);
                    Console.Write("For help visit: ");
                    Console.WriteLine(video.Status.Help);
                }
                else if (stateName == "failed")
                {
                    Console.Write("Video failed uploading because:");
                    Console.WriteLine(video.Status.Value);

                    Console.Write("For help visit: ");
                    Console.WriteLine(video.Status.Help);
                }

                if (video.ReadOnly == false)
                {
                    Console.WriteLine("Video is editable by the current user.");
                }

                if (video.RatingAverage != -1)
                {
                    Console.WriteLine("Average rating: " + video.RatingAverage);
                }
                if (video.ViewCount != -1)
                {
                    Console.WriteLine("View count: " + video.ViewCount);
                }

                Console.WriteLine("Thumbnails:");
                foreach (MediaThumbnail thumbnail in video.Thumbnails)
                {
                    Console.WriteLine("\tThumbnail URL: " + thumbnail.Url);
                    Console.WriteLine("\tThumbnail time index: " + thumbnail.Time);
                }

                Console.WriteLine("Media:");
                foreach (Google.GData.YouTube.MediaContent mediaContent in video.Contents)
                {
                    Console.WriteLine("\tMedia Location: " + mediaContent.Url);
                    Console.WriteLine("\tMedia Type: " + mediaContent.Format);
                    Console.WriteLine("\tDuration: " + mediaContent.Duration);
                }
            }

        }
    }
}