​This is a really old report, and it appears to be related to Polymer 0.5
or so. Are you really seeing the same stack trace? What version of Polymer
are you using?

If you're just having trouble with firefox, chances are you need to include
the polyfills (webcomponentsjs/webcomponents-lite.js). Also, make sure that
the experimental web components support is turned _off_ in Firefox.

​Thanks,
Arthur


On Sun, Oct 30, 2016 at 8:15 PM, <[email protected]> wrote:

> any luck? running into this too.
>
> On Monday, September 1, 2014 at 8:09:19 AM UTC-4, [email protected]
> wrote:
>>
>> I am unable to build an app with vulcanize that will produce something
>> working under Firefox...
>>
>> The build works fine in Chrome.
>>
>> I just updates vulcanize (npm install -g vulcanize or num update -g
>> vulcanize).
>>
>> Maybe I am doing something wrong?
>>
>> I use it like this: vulcanize -o build.html index.html
>>
>> Any hints will be welcomed.
>>
>> I get the following error:
>>
>> Error: Assertion failed platform.js:16
>> "Exception caught during observer callback: .scroll@
>> http://192.168.0.203:3000/gde/longa/build.html:3577:11
>> .modeChanged@http://192.168.0.203:3000/gde/longa/build.html:3554:7
>> g.invokeMethod@http://192.168.0.203:3000/gde/longa/bower_com
>> ponents/polymer/polymer.js:12:12287
>> g.notifyPropertyChanges@http://192.168.0.203:3000/gde/longa/
>> bower_components/polymer/polymer.js:12:10605
>> Observer.prototype.report_@http://192.168.0.203:3000/gde/lon
>> ga/bower_components/platform/platform.js:12:12799
>> CompoundObserver.prototype<.check_@http://192.168.0.203:3000
>> /gde/longa/bower_components/platform/platform.js:12:18328
>> global.Platform.performMicrotaskCheckpoint@http://192.168.0.
>> 203:3000/gde/longa/bower_components/platform/platform.js:12:13714
>> b/<@http://192.168.0.203:3000/gde/longa/bower_components/pla
>> tform/platform.js:16:28898
>> c@http://192.168.0.203:3000/gde/longa/bower_components/platf
>> orm/platform.js:15:13288
>> c@http://192.168.0.203:3000/gde/longa/bower_components/platf
>> orm/platform.js:12:26411
>> b@http://192.168.0.203:3000/gde/longa/bower_components/platf
>> orm/platform.js:12:25943
>> " platform.js:12
>> Observer.prototype.report_() platform.js:12
>> CompoundObserver.prototype<.check_() platform.js:12
>> global.Platform.performMicrotaskCheckpoint() platform.js:12
>> b/<() platform.js:16
>> c() platform.js:15
>> c() platform.js:12
>> b() platform.js:12
>>
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