{{ember power select}} requires onchange function errror

I am using ember-power-select though i have onchange functioon and saveUser function in my controller i get error {{ember power select}} requires onchange function errror

//templates/protected/employee/teachers/new.hbs

{{#power-select options=model.teachers  onchange=(action "saveUser") as |name|}}
      {{name}}
{{/power-select}}

//controllers/protected/employee/teachers/new.js

import Ember from 'ember';

export default Ember.Controller.extend({
  actions: {
    saveUser function(){},
    onchange: function () {} //didnt work even when i removed this
  }
});

Ember Inspector
1.9.3
Ember
1.13.7
Ember Data
1.13.8
jQuery
1.11.3
Ember Simple Auth
1.0.0