Getting error in executequery: "Access Denied"

ClientContext _ctx; Site collSite = _ctx.Site;

                    RecycleBinItemCollection collRBI = collSite.RecycleBin;

                    _ctx.Load(collRBI, items => items.IncludeWithDefaultProperties(item => item.Author, item => item.DeletedBy, item => item.DeletedDate, item => item.ItemState, item => item.LeafName, item => item.Size, item => item.Title, item => item.DirName));
                    _ctx.ExecuteQuery();