[Rails] I think I've found a mistake in Rails tutorial

At the point of this section

       http://ruby.railstutorial.org/chapters/sign-up#sec-signup_failure

clicking the "Create my account" button on the signup form shows the following image at

According to the tutorial, I must modify these files to rid myself of the error.

• app/controllers/users_controller.rb
• app/views/users/new.html.erb
• app/views/shared/_error_messages.html.erb
• app/assets/stylesheets/custom.css.scss

I made all the modifications (until I saw the working image to the 4 files), and I still get the error image above when submitting the file, rather than a page that shows me that I left the fields blank.

 

Can you help with this?

 

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