Rails - Mar 2010 - TIME PICKER HELP

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 get it working

Thanks for any help
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Is that not possible?
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