Puppet users - Jan 2013 - can't convert nil into Hash with create_resource and +>

I am doing something like that:

class users::userlist {

@users::virtual::localuser { "ubuntu":
    sshkey => { 
                        ''test_key''   => { key =>
''XX'' },
                        ''test_key2'' => { key =>
''YY''},
     ,}
    groups => ''test_group'',
}

}

All is good whenever I just 
do realize(Users::Virtual::Localuser[''ubuntu'']), but lets say
I would like
to append some more keys later on in another subclass, 

class users::specific inherits users:userlist {
   realize (Users::Virtual::Localuser[''ubuntu''])
   Users::Virtual::Localuser[''ubuntu''] {
      sshkey +> { 
                 ''test_key3'' +> { key =>
''ZZ''},
      } 
   }
}

*I am getting: Error 400 on SERVER: can''t convert nil into Hash at 
_create_resources invocation_*

The way I am propagating keys:

define localuser
($groups,$pass,$sshkey="",$homedir="/home/$title")

(...) CUT HERE (...) 


$sshuser = { ''user'' => $title }

if ( $sshkey != "" ) {
    create_resources(users::virtual::sshkeys,$sshkey,$sshuser)
}

         $sshuser = { ''user'' => $title }

         define sshkeys($key,$user,$state=''present'') {
                   ssh_authorized_key { "${title}_${user}":
                           ensure  =>      "$state",
                           type    =>      "ssh-rsa",
                           key     =>      $key,
                           user    =>      "$user",
                           require =>      User["$user"],
                           name    =>      "$title",
                   }
          }

Ideas?

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