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Polymer + Dart2js not working

When I create a new application using the Polymer library, it creates a sample project. The project works fine in Dartium, but when I compile (using pub build) it no longer works.

I get two 404 and unsached typeerror.

Here is my console output in Chrome.

GET file:///home/michael/Code/sample/build/web/packages/shadow_dom/shadow_dom.debug.js  sample.html:1
GET file:///home/michael/Code/sample/build/web/packages/custom_element/custom-elements.debug.js  sample.html:2
Uncaught TypeError: Object #<HTMLDocument> has no method 'registerElement' sample.html_bootstrap.dart.js:6681
    wi sample.html_bootstrap.dart.js:6681
    ei sample.html_bootstrap.dart.js:9102
    Ok sample.html_bootstrap.dart.js:9099
    QL sample.html_bootstrap.dart.js:2184
    aX.vV sample.html_bootstrap.dart.js:759
    Vg sample.html_bootstrap.dart.js:644
    (anonymous function) sample.html_bootstrap.dart.js:12464
    init.currentScript sample.html_bootstrap.dart.js:12444
    (anonymous function) sample.html_bootstrap.dart.js:12458
    (anonymous function) sample.html_bootstrap.dart.js:12585

These files exist in build/web/packages/, so I'm not sure why I get 404.

This worked fine before I upgraded to the latest Dart SDK (dev channel). This is just a mistake there, what could happen?

Thank.

Update:

I saw a Dart issue with which I had another problem, so I applied them to fix in the sample project, and now I get only Uncaught TypeError. Now my conclusion is as follows:

Uncaught TypeError: Object #<HTMLDocument> has no method 'registerElement' sample.html_bootstrap.dart.js:6518
    wi sample.html_bootstrap.dart.js:6518
    ei sample.html_bootstrap.dart.js:8949
    Ok sample.html_bootstrap.dart.js:8946
    QL sample.html_bootstrap.dart.js:2142
    aX.vV sample.html_bootstrap.dart.js:725
    Vg sample.html_bootstrap.dart.js:587
    (anonymous function) sample.html_bootstrap.dart.js:12313
    init.currentScript sample.html_bootstrap.dart.js:12293
    (anonymous function) sample.html_bootstrap.dart.js:12307
    (anonymous function) sample.html_bootstrap.dart.js:12434
+3
1

, . pubspec.yaml :

name: sample
description: A sample Polymer application
dependencies:
  browser: any
  polymer: "0.9.5"
transformers:
- polymer:
    entry_points: web/sample.html
+1

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