Youtube Api to fetch all videos on a Channel ( No longer available Error)

We need video by channel-name list of YouTube (using API). When I make a request I get the following error: Error No longer available

Youtube Api v3.

 Uri urlVideo = new Uri(String.Format("http://gdata.youtube.com/feeds/api/users/{0}/uploads/{1}", hipoConfig.canal_youtube, videoId));
                    //Uri urlVideo = new Uri(String.Format("http://gdata.youtube.com/feeds/users/{0}/uploads/{1}", hipoConfig.canal_youtube, videoId));

                //Google.YouTube.Video videoExistente = request.Retrieve<Video>(urlVideo);
                Video videoExistente = request.Retrieve<Video>(urlVideo);