Mutating Prototype Error in Firefox

[Gee Jay Almestas]

Hello I'm having mutating Prototype Error in my firefox 33.1 kindly see image below

http://i.gyazo.com/85b852e2572121d234dd374798d5d8a7.png

i also included webcomponents.js and platform.js on my html

[Gee Jay Almestas]

tried to remove webcomponents.js now im gettings this error in firefox, but in chrome no error

[Aaron Salvo]

While, I despise replies like this...I'll commit the crime for a purpose:

I've never seen that error, BUT...

I'd suggest you only use webcomponents.js, since platform.js is now deprecated. So I'd put webcomponents.js back in and pull out platform.js.

Something I can say (because I got bit by it recently) is that you're most likely not getting the error in Chrome, because Chrome doesn't need the web components polyfills (webcomponents.js).

Everything was looking good on a project I'm working on, until I tested in Safari and Firefox. It's an easy fix, however, to get Chrome loading the polyfills: just add the 'register' attribute to the script tag where you pull in webcomponents.js. 

I hope this was at least a little helpful. Hopefully someone else can weigh in. I personally would love some better strategies for debugging Polymer elements.

[Scott Miles]

`webcomponents.js` is a newer version of `platform.js`. Never load both, just use `webcomponents.js`.

The message you are getting is a Warning (not an Error) and Firefox is the only browser that emits this warning (to my knowledge). Sadly, there is no way to avoid the message, because Custom Elements polyfill must manipulate prototypes to do it's work.

The message is annoying but harmless.

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[Gee Jay Almestas]

ok i use webcomponents.js only and remove platform.js the problem now is my core-icons and paper-fab are not showing up also cant click my navigation

here's my navigation

<core-scaffold id="scaffold" responsiveWidth="640px">
<core-header-panel navigation flex mode="seamed">
<core-toolbar>Navigation</core-toolbar>
<core-menu id="menu">
<core-item name="drawerPanel" icon="home" label="Home"><a href="#"></a></core-item>
<core-item name="about" icon="account-circle" label="Who"></core-item>
<core-item name="works" icon="work" label="Works"></core-item>
<core-item name="skills-cont" icon="gesture" label="Skills" name="skills"></core-item>
<core-item name="contacts-cont" icon="settings-phone" label="Contacts"></core-item>
<core-item name="cart" icon="shopping-cart" label="D Shop"><a href="#" target="_blank"></a></core-item>
<core-item name="v8" icon="link" label="v8"><a href="" target="_blank"></a></core-item>
<core-item name="v7" icon="link" label="v7"><a href="" target="_blank"></a></core-item>
<core-item name="v6" icon="link" label="v6"><a href="" target="_blank"></a></core-item>
</core-menu>

also got this error on firefox ONLY

[Aleks Totic]

That's not an error, that's a warning, and you can ignore it.

Aleks

[Gee Jay Almestas]

i see, any idea why my core icons not showing up when i use webcomponents.js ? but when i use platform.js its working fine

[Gee Jay Almestas]

anyways thanks again for the help guys :)

[Aaron Salvo]

I was getting that exact error (warning), and it sat there and accumulated. Like 1000's of them non-stop.

My my fix was to wipe out the polymer-dev/, polymer/, and platform/ directories and then reinstall the latest versions using Bower.

Still would like to know what was causing that.

On Thursday, November 13, 2014 9:51:17 PM UTC-5, Gee Jay Almestas wrote: