System.ArgumentNullException:Object reference not set?

Question

Hi Team

 

I am getting this exception "Object reference not set to an instance of an object". I am trying to create a checkbox within a form using asp.net mvc. Below is my logic and need some help around this issue to fix it, please mates.

public class EditTrainingRegFormViewModel
   {
       public string Title { get; set; }

       public string FirstName { get; set; }

       public string LastName { get; set; }

       public string Position { get; set; }

       public string Company { get; set; }

       public string Address { get; set; }

       [Display(Name = "Choose country")]
       public int ? SelectedCountryId { get; set; }

       public string Code { get; set; }

       public string City { get; set; }

       public string State { get; set; }

       public string Cell_Number { get; set; }

       public List<CheckBoxes> Dietary_requirement { get; set; }

       public string Email { get; set; }

       public int Country_Id { get; set; }

       public string Country_Name { get; set; }


   }

   public class CheckBoxes
   {
       public string Text { get; set; }
       public bool Checked { get; set; }
   }

       // GET://Manage/Check box for Dietary-Req

       public ActionResult DietReq()
       {
           EditTrainingRegFormViewModel model = new EditTrainingRegFormViewModel();

           model.Dietary_requirement = new List<CheckBoxes>
           {
               new CheckBoxes {Text = "None"},
               new CheckBoxes {Text = "Vegetarian"},
               new CheckBoxes {Text = "Vegan"},
               new CheckBoxes {Text = "Halaal"}
           };

           return View(model);
       }

 <form>
                      <div class="row">
                          <label for="Dietary Requirements">Dietary Requirements</label>
                          <div class="input-group col-md-6 col-md-offset-3 col-sm-6 col-xs-6">
                              <div class="input-group pull-left">
                                  <!---Iteration for checking each name from the list of available diets-->
                                  @for(int i = 0; i<Model.Dietary_requirement.Count; i++) // Error is thrown here as not set to an instance.
                                  {
                                      @Html.HiddenFor(m=>m.Dietary_requirement[i].Text)
                                      @Html.CheckBoxFor(m=>m.Dietary_requirement[i].Checked, new {id = string.Format("dietary_requirement_{0}", i) })
                                  }
                              </div>
                          </div>
                      </div>
                   </form>