Error not displaying with form_with

Good Morning.

I'm following the tutorial http://edgeguides.rubyonrails.org/getting_started.html and I find the following:

I have a controller called ArticlesController. The create method uses the "if @ article.save" statement to save the @article object, and if something goes wrong then render 'new'. Similarly the update method uses "if @article.update (article_params)" to update the record for that article, and if something goes wrong render 'edit'.

In new and edit views <% if @ article.errors.any? %> is used to determine if there was any error and display the corresponding message, but the problem is that in the new view works fine, but in the edit view @article.errors.any view? returns false even if there is an error.

Can someone tell me what's wrong. Thank you very much.

Then I put the ArticlesController class, the views new.html.erb and edit.html.erb, and the article model.

class ArticlesController < ApplicationController
  def new
    @article = Article.new
  end

  def edit
    @article = Article.find(params[:id])
  end

  def update
    @article = Article.find(params[:id])

    if @article.update(article_params)
      redirect_to @article
    else
      render 'edit'
    end
  end

  def index
    @articles = Article.all
  end

  def show
    @article = Article.find(params[:id])
  end

  def create
    @article = Article.new(article_params)

    if @article.save
      redirect_to @article
    else
      render 'new'
    end
  end

  private

  def article_params
    params.require(:article).permit(:title, :text)
  end
end

    ------------------------------------------------------------------

    <h1>New Article</h1>

    <%= form_with scope: :article, url: articles_path, local: true do |form| %>

      <% if @article.errors.any? %>
        <div id="error_explanation">
          <h2>
            <%= pluralize(@article.errors.count, "error") %> prohibited
            this article from being saved:
          </h2>
          <ul>
            <% @article.errors.full_messages.each do |msg| %>
              <li><%= msg %></li>
            <% end %>
          </ul>
        </div>
      <% end %>

      <p>
        <%= form.label :title %><br>
        <%= form.text_field :title %>
      </p>

      <p>
        <%= form.label :text %><br>
        <%= form.text_area :text %>
      </p>

      <p>
        <%= form.submit %>
      </p>
    <% end %>
    <%= link_to 'Back', articles_path %>

    ----------------------------------------------------------------------

    <h1>Edit article</h1>

    <%= form_with(model: @article) do |form| %>

      <% if @article.errors.any? %>
        <div id="error_explanation">
          <h2>
            <%= pluralize(@article.errors.count, "error") %> prohibited
            this article from being saved:
          </h2>
          <ul>
            <% @article.errors.full_messages.each do |msg| %>
              <li><%= msg %></li>
            <% end %>
          </ul>
        </div>
      <% end %>

      <p>
        <%= form.label :title %><br>
        <%= form.text_field :title %>
      </p>

      <p>
        <%= form.label :text %><br>
        <%= form.text_area :text %>
      </p>

      <p>
        <%= form.submit %>
      </p>

    <% end %>

    <%= link_to 'Back', articles_path %>

    ---------------------------------------------------------------------

    class Article < ApplicationRecord
        validates :title, presence: true,
                        length: { minimum: 5 }
        validates :text, presence: true
    end