Problem with constants service use in a template

ember_problem.js

// /app/templates/create-account.hbs

{{#if constants.allowNewRegistration}}
   <form {{action 'createAccount' on='submit'}}>
{{/if}}

// /app/controllers/create-account.js

export default Ember.Controller.extend( {
  ajax: Ember.inject.service(),
  session: Ember.inject.service(),
  constants: Ember.inject.service(),     
.
.
.
});