You should be installing Polymer 0.9.0, not 0.9.0-rc.1.

Other than that, it's hard to know what the problem is without code.
"Polymer.dom is not a function" sounds like you might be importing the 0.5
version of Polymer. Try logging Polymer.version as a sanity check?

On Mon, May 18, 2015 at 1:30 PM, Vincent Uribe <[email protected]>
wrote:

> Hi!
>
> I've been developping a webapp since january and kept going with Polymer
> 0.5 as the 0.8 was not final enough for my tastes. I started migrating to
> the 0.9 today and have been somewhat battling with this error:
>
> Uncaught TypeError: Polymer.dom is not a function
> Uncaught TypeError: Cannot read property 'instanceCount' of undefined
> Uncaught NotSupportedError: Failed to execute 'registerElement' on
> 'Document': Registration failed for type 'paper-ripple'. A type with that
> name is already registered.
>
> This is my bower.json:
>
>   "dependencies": {
>     "polymer": "Polymer/polymer",
>     "iron-ajax": "PolymerElements/iron-ajax",
>     "iron-autogrow-textarea": "PolymerElements/iron-autogrow-textarea",
>     "iron-icon": "PolymerElements/iron-icon",
>     "iron-a11y-keys-behavior": "PolymerElements/iron-a11y-keys-behavior",
>     "iron-a11y-keys": "PolymerElements/iron-a11y-keys",
>     "iron-input": "PolymerElements/iron-input",
>     "iron-signals": "PolymerElements/iron-signals",
>     "iron-icons": "PolymerElements/iron-icons",
>     "iron-collapse": "PolymerElements/iron-collapse",
>     "iron-flex-layout": "PolymerElements/iron-flex-layout",
>     "iron-fit-behavior": "PolymerElements/iron-fit-behavior",
>     "paper-button": "PolymerElements/paper-button",
>     "paper-toolbar": "PolymerElements/paper-toolbar",
>     "paper-tabs": "PolymerElements/paper-tabs",
>     "paper-toast": "PolymerElements/paper-toast",
>     "paper-menu": "PolymerElements/paper-menu",
>     "paper-item": "PolymerElements/paper-item",
>     "paper-header-panel": "PolymerElements/paper-header-panel",
>     "paper-icon-button": "PolymerElements/paper-icon-button",
>     "paper-drawer-panel": "PolymerElements/paper-drawer-panel",
>     "paper-checkbox": "PolymerElements/paper-checkbox",
>     "layout": "Polymer/layout",
>     "neon-animation": "PolymerElements/neon-animation"
>   },
>   "resolutions": {
>     "polymer": "v0.9.0-rc.1",
>     "webcomponentsjs": "^0.6.0"
>   }
>
> Am I doing something wrong?
>
> Thanks in advance.
>
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