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Ruby Build a Simple Ruby on Rails Application Creating an Authentication System Generating the Devise Views

undefined method `first_name' for #<User:

ActionView::Template::Error (undefined method first_name' for #<User:0x007fca0c6744a8>): 4: <%= devise_error_messages! %> 5: 6: <div><%= f.label :first_name %> <br /> 7: <%= f.text_field :first_name %></div> 8: 9: <div><%= f.label :last_name%> <br /> 10: <%= f.text_field :last_name%></div> app/views/devise/registrations/new.html.erb:7:inblock in app_views_devise_registrations_new_html_erb37566663658031088_47565040' app/views/devise/registrations/new.html.erb:3:in `_app_views_devise_registrations_new_html_erb_37566663658031088_47565040'