Rails - Mar 2010 - Java script errrrror in rails

when i click a button  called add it  should    show a  javascript  form
showing an upload    feature.its  not displaying  anything.instead of
tht its  only  showing  the mwssage lik tis  in console. please providee
a solution


ActionView::TemplateError (Called id for nil, which would mistakenly be
4 -- if you really wanted the id of nil, use object_id) on line #1 of
app/views/lists/import.js.rjs:
1: id = dom_id(@list)
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> ActionView::TemplateError (Called id for nil, which would mistakenly be
> 4 -- if you really wanted the id of nil, use object_id) on line #1 of
> app/views/lists/import.js.rjs:
> 1: id = dom_id(@list)
Will need to see some code - however the simple answer from your error 
is that @list is nil.  Perhaps you are missing a:

@list = List.find(params[:id])

before this line 1?

Kind Regards
Luke
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