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I am stuck with validation issue and I don't know how to proceed. Here is my controller code

  if (Input::method() == 'POST')
  {
   $val = Model_Article::validate('create');
      
   if ($val->run())
   {
    $article = Model_Article::create_article();

    if ($article)
    {
     Session::set_flash('success', '?lanek dodan #'.$user->id.'.');
     Response::redirect('admin/users');
    }
    else
    {
     Session::set_flash('error', 'Napaka pri dodajanju ?lanka.');
    }
   }
   else
   {
    $errors = $val->error();
   }
  }

and my Model_Article code

 public static function validate($factory)
 {
  $val = Validation::forge($factory);
  $val->add_field('category_id', 'Kategorija', 'required');
  $val->add_field('title', 'Naslov ?lanka', 'required|max_length[500]');
  $val->add_field('summary', 'Povzetek ?lanka', 'required|max_length[500]');
  $val->add_field('body', 'Vsebina', 'required');
  $val->add_field('tags', 'Tagi', 'required');
  return $val;
 }

The $val->run() will always return false... And the $val->error() is empty, so there are no input errors. What else could be wrong?