我在下面有一个imports.html页面，我正在硫化。
奇怪的是……通常在我的index.html我有
<link rel="import" href="bower_components/polymer/polymer.html">……这不在imports.html。但是当我硫化时imports.html，不知何故它被包含在内，我必须<link rel="import" href="bower_components/polymer/polymer.html">从我的index.html. 否则，我会得到
Uncaught NotSupportedError: Failed to execute 'registerElement' on 'Document': Registration failed for type 'dom-module'. A type with that name is already registered.
polymer.html当我硫化时来自哪里imports.html？因为它不在imports.html.
!-- custom style sheets-->
<link rel="stylesheet" href="css/splash.css">
<link rel="stylesheet" href="css/main.css">
<link rel="stylesheet" href="css/fade-title-animation.css">
<link rel="stylesheet" href="css/paper-ripple.css">
<link rel="stylesheet" href="css/slider-animation.css">
<link rel="stylesheet" href="bower_components/components-font-awesome/css/font
-awesome.min.css">
<!-- custom style sheets-->
<!-- bower components -->
<link rel="import" href="bower_components/paper-menu/paper-menu.html">
<link rel="import" href="bower_components/paper-item/paper-item.html">
<link rel="import" href="bower_components/paper-drawer-panel/paper-drawer-panel.html">
<link rel="import" href="bower_components/iron-flex-layout/iron-flex-layout.html">
<link rel="import" href="bower_components/paper-header-panel/paper-header-panel.html">
<link rel="import" href="bower_components/iron-collapse/iron-collapse.html">
<link rel="import" href="bower_components/iron-icon/iron-icon.html">
<link rel="import" href="bower_components/iron-icons/editor-icons.html">
<link rel="import" href="bower_components/paper-ripple/paper-ripple.html">
<link rel="import" href="bower_components/iron-icons/iron-icons.html">
<link rel="import" href="bower_components/iron-icons/image-icons.html">
<link rel="import" href="bower_components/paper-toolbar/paper-toolbar.html">
<link rel="import" href="bower_components/paper-material/paper-material.html">
<link rel="import" href="bower_components/paper-card/paper-card.html">
<link rel="import" href="bower_components/iron-media-query/iron-media-query.html">
<link rel="import" href="bower_components/paper-fab/paper-fab.html">
<link rel="import" href="bower_components/paper-button/paper-button.html">
<link rel="import" href="bower_components/paper-icon-button/paper-icon-button.html">
<link rel="import" href="bower_components/paper-tabs/paper-tabs.html">
<!-- bower components -->
<!-- custom elements -->
<link rel="import" href="elements/portfolio/cards/card-behavior.html">
<link rel="import" href="elements/page-behavior.html">
<link rel="import" href="elements/page-styles.html">
<link rel="import" href="elements/footer-custom.html">
<link rel="import" href="elements/toolbar-menus/paper-menu-custom.html">
<link rel="import" href="elements/toolbar-menus/paper-tabs-custom.html">
<link rel="import" href="elements/portfolio/cards/portfolio-card-styles.html">
<link rel="import" href="elements/portfolio/portfolio-display.html">
<link rel="import" href="elements/portfolio/portfolio-page.html">
<link rel="import" href="elements/portfolio/cards/cloud-share-image-card.html">
<link rel="import" href="elements/portfolio/cards/cloud-monitor-card.html">
<link rel="import" href="elements/portfolio/cards/legacy-darin-card.html">
<link rel="import" href="elements/portfolio/cards/dad-site-card.html">
<link rel="import" href="elements/portfolio/cards/gulp-newy-card.html">
<link rel="import" href="elements/portfolio/cards/darin-hensley-card.html">
<link rel="import" href="elements/portfolio/cards/krunch-uploader-card.html">
<link rel="import" href="elements/resume/resume-page.html">
<link rel="import" href="elements/resume/resume-display.html">
<link rel="import" href="elements/contact-display.html">
<!-- custom elements -->
<!-- js -->
<script src="js/misc.js" ></script>
<script src="bower_components/page/page.js"></script>
<script src="js/router.js"></script>
<script src="js/resume.js"></script>
<script src="js/pdf.js"></script>
<script src="js/pdf.worker.js"></script>
<script src="js/initialize.js" defer></script>
<!-- js -->