linter error being shown when it shouldn't

[tylerthehaas]

getting is undefined in my editor. I have verified the path to iron-ajax under bower_components is correct

<link rel="import" href="../../polymer/polymer.html">
<link rel="import" href="../ep-select-by-participant.html">
<link rel="import" href="../../iron-ajax/iron-ajax.html">

<style is="custom-style" include="demo-pages-shared-styles">
  .vertical-section-container {
    max-width: 960px;
  }
</style>

<dom-module is="demo-component">
  <template>
    <iron-ajax id="participants"
      auto
      url="http://localhost:3000/participants"
      handle-as="json"
      on-response="getItems"
      last-response="{{ajaxResponse}}"></iron-ajax>