[Mailman-Users] error when adding an unsubscribe link to email footer

[Web Analysts]

   When I try and add

Unsubscribe: %(user_optionsurl)s?password=%(user_password)s&unsub=1&unsubconfirm
=1
to Footer added to mail sent to regular list member
I get the error

  Warning: The following illegal substitution variables were found in the
  msg_footer string: user_optionsurl, user_password

   Your list may not operate properly until you correct this problem.