My first DART polymer project: No execution / testing possible, nothing works? -

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i have created polymer project. generates default app reverses text entered input field. works.

then tried add core-header-panel. copied code description page index.html file of project:

<body unresolved fullbleed layout vertical>   <core-header-panel flex>     <core-toolbar>       <div>hello world!</div>     </core-toolbar>   </core-header-panel>    <main-app>   </main-app>    <script type="application/dart">export 'package:polymer/init.dart';</script> </body>

this gets me 3 warnings on displayed web page. 2 say:

custom element found in document body without "unresolved" attribute on or 1 of parents.

i have inserted unresolved attribute after body tag. not understand why error not go away.

the third messages is:

custom element name core-toolbar not found

i added line

<link rel="import" href="packages/core_elements/core_toolbar.html">

but error message did not go away.

finally outcommented complete core-header-panel , nevertheless page in dartium still shows "hello world" , error messages.

i'm lost here. dart editor / dartium "development system" seems useless. can not test simplest things. doing wrong? how work system???

btw: same behaviour when try run javascript in firefox browser ...

you need add import core-toolbar , core-header-panel.

you need add dependency pubspec.yaml file.

dependencies:   core_elements:

otherwise can't see wrong.
if doesn't work, please try run pub cache repair in project directory (from command line). if still doesn't work please add complete content of pubspec.yaml, pubspec.lock , index.html question.


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