Ruby on Rails

I have just installed ruby on rails on my window. and I was going
through tutorials in
http://guides.rubyonrails.org/v4.2/getting_started.html and I am getting
this error (ExecJS::ProgramError in Articles#index ) So I just removed
the line no 6 from /app/views/layouts/application.html.erb that is <%=
javascript_include_tag 'application', 'data-turbolinks-track' => true %>

And issue solved. and going further with the tutorial I came up in
delete operation.
http://guides.rubyonrails.org/v4.2/getting_started.html#deleting-articles

But my data is not getting deleted. It just redirect to the show page of
the data which I want to delete.

Attachments:
http://www.ruby-forum.com/attachment/11308/articles_controller.rb
http://www.ruby-forum.com/attachment/11309/application_controller.rb
http://www.ruby-forum.com/attachment/11310/application.html.erb
http://www.ruby-forum.com/attachment/11311/index.html.erb


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