在社交登录中没有为此对象定义无参数构造函数

Question

我在我的应用程序中实现社交登录，但是我收到错误“没有为此对象定义无参数构造函数。”我无法找出这背后的原因。任何人都告诉我究竟是什么haapening.My Controller如下：

[AllowAnonymous]
public ActionResult ExternalLoginCallback(string returnUrl)
{
    AuthenticationResult result = OAuthWebSecurity.VerifyAuthentication(Url.Action("ExternalLoginCallback", new { ReturnUrl = returnUrl }));
    if (!result.IsSuccessful)
    {
        return RedirectToAction("ExternalLoginFailure");
    }

    if (OAuthWebSecurity.Login(result.Provider, result.ProviderUserId, createPersistentCookie: false))
    {
        return RedirectToLocal(returnUrl);

    }

    if (User.Identity.IsAuthenticated)
    {
        // If the current user is logged in add the new account
        OAuthWebSecurity.CreateOrUpdateAccount(result.Provider, result.ProviderUserId, User.Identity.Name);
        return RedirectToLocal(returnUrl);
    }
    else
    {
        // User is new, ask for their desired membership name
        string loginData = OAuthWebSecurity.SerializeProviderUserId(result.Provider, result.ProviderUserId);
        ViewBag.ProviderDisplayName = OAuthWebSecurity.GetOAuthClientData(result.Provider).DisplayName;
        ViewBag.ReturnUrl = returnUrl;
        return View("ExternalLoginConfirmation", new RegisterExternalLoginModel { UserName = result.UserName, ExternalLoginData = loginData });
    }
}

我在这一行收到错误：

if (OAuthWebSecurity.Login(result.Provider, result.ProviderUserId, createPersistentCookie: false))

请告诉我..