Get user info error : DotNetOpenAuth.Messaging.ProtocolException: No OpenID endpoint found. ---> System.InvalidOperationException: 序列未包含項目 於 System.Linq.Enumerable.First[TSource](IEnumerable`1 source) 於 DotNetOpenAuth.OpenId.RelyingParty.OpenIdRelyingParty.CreateRequest(Identifier userSuppliedIdentifier) --- 內部例外狀況堆疊追蹤的結尾 --- 於 DotNetOpenAuth.OpenId.RelyingParty.OpenIdRelyingParty.CreateRequest(Identifier userSuppliedIdentifier) 於 ASP.login_aspx.Page_Load(Object sender, EventArgs e)