Entity validation error in ASP.NET MVC

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ASP.NET

C#5.0

entity-framework

I am getting Entity Validation Error on clicking to the AddNewPost Page. usually the validation error occurs when you submit the form but when i click on the page where actually the submit form is, i am getting an entity validation error. When i debug the code to check which database entities are making problem. i saw three entities are required. but these entities should prompted such error when i submit the form. what are the possible solutions when these error occurs on going to the form page.

What I have tried:

The error I am getting

Server Error in '/' Application.

Validation failed for one or more entities. See 'EntityValidationErrors' property for more details

Visual Studio Debugging Image

http://imgur.com/a/CbpEM

Controllers Index and add post

public ActionResult Index()
       {
           AdminObserver observer1 = new AdminObserver();

           ActivityObserver observer2 = new ActivityObserver();

          // ForumNotifier notifier = new ForumNotifier();
           ForumNotfier notifier = new ForumNotfier();


           notifier.Subscribe(observer1);

           notifier.Subscribe(observer2);


           return View();
           //return View();
       }

       public ActionResult AddPost(ForumPost post)
       {
           post.PostedOn = DateTime.Now;
           using (AppDbContext db = new AppDbContext())
           {
               try {
               db.ForumPosts.Add(post);
               db.SaveChanges();
               }
               catch (DbEntityValidationException e)
               {
                   foreach (var eve in e.EntityValidationErrors)
                   {
                       Console.WriteLine("Entity of type \"{0}\" in state \"{1}\" has the following validation errors:",
                           eve.Entry.Entity.GetType().Name, eve.Entry.State);
                       foreach (var ve in eve.ValidationErrors)
                       {
                           Console.WriteLine("- Property: \"{0}\", Error: \"{1}\"",
                               ve.PropertyName, ve.ErrorMessage);
                       }
                   }
                   throw;


               }
           }
           ViewBag.Message = "Post submitted successfully!";
           ForumNotfier notifier = new ForumNotfier();
           notifier.Notify(post);
           return View("Index", post);
       }

Forumpost in model

namespace observer.Models
{
    [Table("ForumPosts")]
    public class ForumPost
    {
            [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
            public int Id { get; set; }
            [Required]
            [StringLength(20)]
            public string UserName { get; set; }
            [Required]
            [StringLength(100)]
             public string Title { get; set; }
            [Required]
            [StringLength(100)]
            public string Description { get; set; }
            [Required]
            public DateTime PostedOn { get; set; }
    }

AddPost View

@using (Html.BeginForm()) 
{
    @Html.AntiForgeryToken()
    
    <div class="form-horizontal">
        <h4>ForumPost</h4>
        <hr />
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        <div class="form-group">
            @Html.LabelFor(model => model.UserName, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.UserName, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.UserName, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Title, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Title, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Title, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Description, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Description, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Description, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.PostedOn, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.PostedOn, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.PostedOn, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="Create" class="btn btn-default" />
            </div>
        </div>
    </div>
}