jQuery Ajax Call returns error : ASP.NET MVC

"HomeController.cs" - this is my controller class. "ForgotPassword" - this is the action result method in the above class.

    [HttpPost]
    public ActionResult ForgotPassword(string EmailID)
    {
        SendMail(EmailID);
        return View();
    }

In SendMail() function, I am sending a verification link to the passing EmailID. I am calling this method via jQuery Ajax Method like below:

    $('#btnSubmit').click(function (e) {

            var emailRegex = new RegExp(/^([\w\.\-]+)@@([\w\-]+)((\.(\w){2,3})+)$/i);
            //var emailRegex = new RegExp(/^([\w-\.]+)@@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$/);
            var emailAddress = $("#txtEmail").val();
            //alert(emailAddress);
            var valid = emailRegex.test(emailAddress);
            if (!valid) {
                alert("Please Enter Valid Email address");
                return false;
            } else {
                alert(emailAddress);
                //return true;
                $.ajax({
                    url: '@Url.Content("~/Home/ForgotPassword")',
                    async: false,
                    type: "POST",
                    data: JSON.stringify({ 'EmailID': emailAddress }),
                    dataType: "json",
                    contentType: "application/json; charset=utf-8",
                    error: function (response) {
                        alert("Error");
                        alert(JSON.stringify(response));
                        //$("#errMsg").css('background', 'red');
                        //$("#errMsg").html(data.Message);
                    },
                    success: function (response) {
                        //$("#errMsg").css('background', 'green');
                        //$("#errMsg").html("Mail Sent");
                        alert(JSON.stringify(response));
                    }

                });
            }
        });

This is my View:

  <input type="text" name="EmailID" id="txtEmail" width="600" />
  <input type="submit" name="btnSubmit" id="btnSubmit" value="Send" />

I am calling this method when button click of "btnSubmit".

Everything is working fine. The SendMail() function is called and the mail is also send to the passing mailid. But I am getting error in the jQuery Ajax.

  error: function (response) {
                        alert("Error");
                        alert(JSON.stringify(response));
                        //$("#errMsg").css('background', 'red');
                        //$("#errMsg").html(data.Message);
                    },

I want to display the successful message in the view. But getting error. What is actually the problem? How to solve this?