prototype.registerCallback is not a function

[NAC]

I am newbie with Polymer 0.9. I tried to use core-icon but I've been stuck this error when I imported core-icon.html

post-list.html

<link rel="import" href="bower_components/polymer/polymer.html">

<link rel="import" href="bower_components/core-icon/core-icon.html">

<dom-module name="post-list">

<template>

<h1>Here's Post List</h1>

</template>

<script>

Polymer({

 is: 'post-list',

});

</script>

</dom-module>

[adeni...@googlemail.com]

core-icon.html is 0.5, you should now use https://github.com/polymerelements/iron-icon with Polymer 0.9+