I see an error even though my password is correct

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Ajax

MVC

jQuery

hello friends I go to the login.controller file from the login.js file, if the password is correct, I redirect to the home page.However, although it is redirected to the home page, the home page does not open, login.js falls into the error block and gives a json error.json.I do not parse.I only create Session.If the sessionID in the database is the same, I open the home page.thanks I have not found it for 2 days.

login.js file

function Login() {
var mail = $("#mail").val();
var password = $("#password").val();

if (mail == null || password == null) {
    var dialog = bootbox.dialog({
        title: "Uyarı",
        message: "<label class='control-label'>invalid mail or password</label>",
        size: 'small',
        locale: 'tr',
        onEscape: true,
        buttons: {
            ok: {
                label: 'Tamam',
                className: 'btn-default',
                callback: function (result) {

                    runKey = false;
                }
            }
        }, onEscape: function (result) {
            runKey = false;
            return false;
        }
    });
}
else {
    user = {};
    user["MAIL"] = mail;
    user["PASSWORD"] = password;

    $.ajax({
        url: '/Login/Login',
        type: 'POST',
        dataType: 'json',
        contentType: 'application/json; charset=utf-8',
        async: false,
        data: JSON.stringify({
            user: user
        }),
        success: function (result) {

        },
        error: function (jqXHR, textStatus, errorThrown) {

             console.log(errorThrown)
        }
    }).done(function () {
    });
}

homeController.cs

public ActionResult Index()
{

        if (!string.IsNullOrEmpty(SessionManager.Get<string>("SystemAuthToken") as string))
        {
            string userID = string.Empty;
            string serverSession = string.Empty;
            string clientSession = string.Empty;

              clientSession = BaseCore.Decrypt(Session["SystemAuthToken"].ToString(), true);
            userID = SessionManager.Get<string>("USER_ID");
            serverSession = new SettingBL().GetSession(int.Parse(userID));

            SessionManager.Save<string>("USER_ID", userID);

            if (serverSession.Equals(clientSession))
            {
                return View();
            }
            else
            {
                return RedirectToAction("Index", "Login");
            }

        }
        else
        {
            bool cookie = new SettingController().CheckRememberMeCookie(this.HttpContext);

            if (cookie)
                return View();
            else
                return RedirectToAction("Index", "Login");
        }

}

RouteConfig.cs

  public class RouteConfig
{
    public static void RegisterRoutes(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
        routes.MapRoute(
            "Default",
            "{controller}/{action}/{id}",
            new { controller = "Login", action = "Index", id = UrlParameter.Optional },
            new string[] { "Project.Controllers" }
        );
    }
}

What I have tried:

login.js file json.parse error

error: function (jqXHR, textStatus, errorThrown) {
        errorThrown >     <pre>'<', "<!DOCTYPE "... is not valid JSON

       }

if I do F5 after the error, it opens the home page