Ruby on Rails

I defined a renew route for membership resources as following :

scope 'users' do
....
resources :memberships do
member do
post 'renew'
end
end
....
end

which leads to:
renew_membership POST (/:locale)/users/memberships/:id/
renew(.:format) {:action=>"renew", :controller=>"memberships"}

and in my view , my form helper is written as :
= form_for membership, :url => renew_membership_path(membership) do |
f|
...
generating the following HTML code :

<form accept-charset="UTF-8" action="/en_GB/users/memberships/1034/
renew" class="edit_membership" id="edit_membership_1034"
method="post">

<div style="margin:0;padding:0;display:inline">
<input name="utf8" type="hidden" value="✓">
<input name="_method" type="hidden" value="put">
<input name="authenticity_token" type="hidden" value="MDNH/
VmfJHBTgur3lksWEEuU5Rp02v70s8UFGR3hxG4="></div>

submitting the form, I get a routing error :

Started POST "/users/memberships/1034/renew" for 127.0.0.1 at
2011-06-30 16:33:08 +0200
Processing by ErrorsController#routing as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"MDNH/
VmfJHBTgur3lksWEEuU5Rp02v70s8UFGR3hxG4=", "commit"=>"Renew this
Membership", "a"=>"users/memberships/1034/renew"}

what could be wrong ?

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