Devise not displaying error messge during an authentication failure?

Question

I was expecting a flash notice when authentication failures occurs in devise. But get nothing during a authentication failure, just the page refreshes and remains still. I

Answer 1

Atlast after some good amount of searching/browsing I found the answer,
you have to add the following piece of code in our application.html.erb file

  <%- flash.each do |name, msg| -%>
    <%= content_tag :div, msg, :id => "flash_#{name}" if msg.is_a?(String) %>
  <%- end -%>  

After adding this I was able to see the sign_in failures alert messages :).