Active Scaffold

Hi all,
     I'm using activescaffold in my application. I have installed that
plugin. When i click the link for active scaffold UI, i' getting the
following error. Please help me to recover this problem.

undefined local variable or method `calendar_date_select_javascripts'
for #<ActionView::Base:0xb67f2694>

I have included following code in layout file

   <%= javascript_include_tag :defaults %>
   <%= active_scaffold_includes %>
   <%= stylesheet_link_tag 'scaffold' %>

Please help me. Thank you.