Some Power Select Issue

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
    translations: [
    {
			reviewer: "333",
			sapCode: "!!!",
			tid: 1,
    },
    {
			reviewer: "555",
			sapCode: "???",
			tid: 2,
    },
    {
			reviewer: "777",
			sapCode: "&&&",
			tid: 3,
    }
  ],
  reviewers: [
  	{label: " qwe", value: "000"},
    {label: " asd", value: "111"},
    {label: " zxc", value: "222"},
    {label: " rty", value: "333"},
    {label: " fgh", value: "444"},
    {label: " vbn", value: "555"},
    {label: " uio", value: "666"},
    {label: " jkl", value: "777"},
    {label: " mop", value: "888"}
  ]
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
<table>
	{{#each translations as |translation|}}
  	<tr>
  		<td>
      	{{translation.sapCode}}
      </td>
      <td>
      	{{#power-select
      		options=reviewers
        	searchField="label"
        	searchPlaceholder="Type to search..."
        	allowClear=true
        	selected=(if (eq translation.reviewer item.value) item)
        	placeholder="Select Reviewer"
        	onchange=(action "reviewerChange" translation.tid) as |item|}}
        		{{item.label}}
        	{{/power-select}}
      </td>
    </tr>
  {{/each}}
</table>
<br>
<br>

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}