       JInvitation = require '../invitation'
       JInvitation.byCode invitationToken, (err, invitation_) =>
         return callback err  if err
-        return callback { message: "invitation is not valid" }  unless invitation_
+        return callback errorize "invitation is not valid"  unless invitation_
         invitation = invitation_
         queue.next()
 


        cursor.nextObject (err, data) ->
          return callback err  if err?
          return callback { message: 'Unrecognized email' }  unless data?

          callback null, data.username
    else

  @removeFromGuestsGroup = (account, callback) ->
    JGroup.one { slug: 'guests' }, (err, guestsGroup) ->
      return callback err  if err?
      return callback errorize "Guests group not found!"  unless guestsGroup?
      guestsGroup.removeMember account, callback

  createGroupStack = (account, groupName, callback)->
