search for: time_picker

I have installed time picker in my application using the below url. ruby script/plugin install http://timepicker.rubyforge.org/svn/trunk/ <%=time_picker(Time.now, {:time_format => ''12'', :minute_step => 30})%> when i use like above in my list.rhtml file , i get error like below undefined method `leading_zero_on_single_digits'' for #<ActionView::Base:0x45b0d48> how i should use it... kindly help me out to...