tools: Vulcanize generated file generates lots of errors

I am trying to get vulcanize to work but am having very little luck. I have a bunch of components:

    <link rel="import" href="./components/core-toolbar/core-toolbar.html">
    <link rel="import" href="./components/core-pages/core-pages.html">
    <link rel="import" href="./components/core-menu/core-menu.html">
    <link rel="import" href="./components/core-menu/core-submenu.html">
    <link rel="import" href="./components/core-item/core-item.html">
    <link rel="import" href="./components/core-scaffold/core-scaffold.html">
    <link rel="import" href="./components/core-icons/core-icons.html">
    <link rel="import" href="./components/core-icons/communication-icons.html">
    <link rel="import" href="./components/core-icon-button/core-icon-button.html">
    <link rel="import" href="./components/core-animation/core-animation.html">
    <link rel="import" href="./components/core-tooltip/core-tooltip.html">
    <link rel="import" href="./components/core-media-query/core-media-query.html">
    <link rel="import" href="./components/paper-tabs/paper-tabs.html">
    <link rel="import" href="./elements/ucd-aggiefeed-validate-auth.html">
    <link rel="import" href="./elements/ucd-aggiefeed-source-filter.html">
    <link rel="import" href="./elements/ucd-aggiefeed-events.html">

and am using: vulcanize index.html

… to generate vulcanized.html.

When I then use vulcanized.html, i am getting the following errors:

Uncaught TypeError: flags.log.split is not a function(anonymous function) @ webcomponents.js:30(anonymous function) @ webcomponents.js:52
polymer.js:6384 Uncaught HierarchyRequestError: Failed to execute 'appendChild' on 'Node': Only one element on document allowed.(anonymous function) @ polymer.js:6384(anonymous function) @ polymer.js:6389(anonymous function) @ polymer.js:7507
core-meta.html:68 Uncaught TypeError: Polymer is not a function(anonymous function) @ core-meta.html:68(anonymous function) @ core-meta.html:142
core-iconset.html:67 Uncaught TypeError: Polymer is not a function(anonymous function) @ core-iconset.html:67
core-iconset-svg.html:56 Uncaught TypeError: Polymer is not a function(anonymous function) @ core-iconset-svg.html:56
core-icon.html:70 Uncaught TypeError: Polymer is not a function(anonymous function) @ core-icon.html:70(anonymous function) @ core-icon.html:200
vulcanized.html:528 Uncaught TypeError: Polymer.mixin is not a function(anonymous function) @ vulcanized.html:528(anonymous function) @ vulcanized.html:664
vulcanized.html:1138 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:1138(anonymous function) @ vulcanized.html:1199
vulcanized.html:1206 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:1206
vulcanized.html:1288 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:1288
vulcanized.html:1796 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:1796
vulcanized.html:2004 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:2004(anonymous function) @ vulcanized.html:2046
vulcanized.html:2079 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:2079
vulcanized.html:2089 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:2089(anonymous function) @ vulcanized.html:2163
vulcanized.html:2171 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:2171
vulcanized.html:2401 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:2401(anonymous function) @ vulcanized.html:2531
vulcanized.html:2591 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:2591
vulcanized.html:2630 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:2630
vulcanized.html:2931 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:2931
vulcanized.html:2986 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:2986
vulcanized.html:3212 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:3212
vulcanized.html:3629 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:3629
vulcanized.html:3817 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:3817
vulcanized.html:4258 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:4258
vulcanized.html:4359 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:4359
vulcanized.html:4534 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:4534(anonymous function) @ vulcanized.html:4914
vulcanized.html:4931 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:4931
vulcanized.html:4966 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:4966
polymer-mixin.js:7 Uncaught TypeError: Polymer.mixin is not a functionPolymer.mixin2 @ polymer-mixin.js:7(anonymous function) @ vulcanized.html:5225(anonymous function) @ vulcanized.html:5228
vulcanized.html:5445 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:5445(anonymous function) @ vulcanized.html:5635
polymer-mixin.js:7 Uncaught TypeError: Polymer.mixin is not a functionPolymer.mixin2 @ polymer-mixin.js:7(anonymous function) @ vulcanized.html:5773(anonymous function) @ vulcanized.html:5776
vulcanized.html:5821 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:5821
vulcanized.html:5934 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:5934
vulcanized.html:6074 Uncaught TypeError: Polymer.mixin is not a function(anonymous function) @ vulcanized.html:6074
vulcanized.html:6319 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:6319
vulcanized.html:6410 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:6410
vulcanized.html:6821 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:6821
vulcanized.html:7035 Uncaught TypeError: Polymer.mixin is not a function(anonymous function) @ vulcanized.html:7035(anonymous function) @ vulcanized.html:8158
vulcanized.html:8174 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:8174(anonymous function) @ vulcanized.html:8235
vulcanized.html:8368 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:8368
vulcanized.html:8618 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:8618
vulcanized.html:8647 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:8647
vulcanized.html:8716 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:8716
vulcanized.html:8743 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:8743(anonymous function) @ vulcanized.html:8823
vulcanized.html:8830 Uncaught TypeError: Polymer.mixin is not a function(anonymous function) @ vulcanized.html:8830(anonymous function) @ vulcanized.html:9484
vulcanized.html:9539 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:9539
vulcanized.html:9754 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:9754(anonymous function) @ vulcanized.html:9931
vulcanized.html:9983 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:9983
vulcanized.html:10214 Uncaught TypeError: Polymer is not a function(anonymous function) @ vulcanized.html:10214

What am I doing wrong?