ASP.NET MVC identity: Invalid token while resetting password

Hi , am trying to add the reset password reset functionality in my web application , so  when enter my email address and submit the form i receive the email that contains  the token etc , then when i click on the link i got redirected to the reset password page , there i enter my email and the new password  , then when i hit reset button i got the following  error from the resetPassword action , "INVALID TOKEN" here 's my code and thank you.

 public async Task<ActionResult> ForgotPassword(Models.ForgotPasswordViewModel model)
        {


            if (ModelState.IsValid)
            {
                var user = await UserManager.FindByEmailAsync(model.Email);
                if (user == null)
                {
                    // Don't reveal that the user does not exist or is not confirmed
                    return View("ForgotPasswordConfirmation");
                }
                // var provider = new DpapiDataProtectionProvider("CoreProject");
                //UserManager.UserTokenProvider = new DataProtectorTokenProvider<ApplicationUser>(provider.Create("ForgotPassword"));
                string code = await UserManager.GeneratePasswordResetTokenAsync(user.Id);
                var callbackUrl = Url.Action("ResetPassword", "Home", new { userId = user.Id, code = HttpUtility.UrlEncode(code) }, protocol: Request.Url.Scheme);
                await SendMail(user.Email,callbackUrl);
                return RedirectToAction("ForgotPassword", "Home");

  public async Task<ActionResult> ResetPassword(Models.ResetPasswordViewModel model)
        {
            var user = await UserManager.FindByEmailAsync(model.Email);
            if (user == null)
            {
                ViewBag.error = "Invalid email adress";
                return View(model);
            }
            else
            {

                //var provider = new DpapiDataProtectionProvider("CoreProject");
                //UserManager.UserTokenProvider = new DataProtectorTokenProvider<ApplicationUser>(provider.Create("ForgotPassword"));

                var result = await UserManager.ResetPasswordAsync(user.Id,HttpUtility.UrlDecode(model.Code),model.Password);
                if (result.Succeeded)
                {
                    RedirectToAction("Login");
                }
                else
                {
                    return View(model);
                }
            }
            return View();