Try using github urls instead element name (
https://github.com/PolymerElements/paper-toggle-button.git#2.0-preview). As 
tags for  2.0-preview are not yet created, bower might not be able to find 
the required tag/branch.

On Tuesday, April 25, 2017 at 10:38:15 PM UTC+5:30, Laurent Besson wrote:
>
> Hi,
>
> I would like to upgrade my custom component to class-based elements on an 
> hybrid poject.
> My project run actually with Polymer 1.7.1 and I would like to switch to 
> a Hybrid project having Polymer 1.7.1 and have Polymer 2.0.0-rc.7 in 
> parallel. I followed this guide 
> https://www.polymer-project.org/2.0/docs/devguide/hybrid-elements.
>
> I tried to update too update my following  dependencies:
>
> "paper-button": "PolymerElements/paper-button#2.0-preview", 
> "paper-input": "PolymerElements/paper-input#2.0-preview", 
> "paper-icon-button": "PolymerElements/paper-icon-button#2.0-preview", 
> "paper-card": "PolymerElements/paper-card#2.0-preview", 
> "paper-toggle-button": "PolymerElements/paper-toggle-button#2.0-preview", 
> "paper-tooltip": "PolymerElements/paper-tooltip#2.0-preview", 
> "paper-material": "PolymerElements/paper-material#2.0-preview", 
> "paper-spinner": "PolymerElements/paper-spinner#2.0-preview", 
> "paper-item": "PolymerElements/paper-item#2.0-preview", 
> "paper-dialog": "PolymerElements/paper-dialog#2.0-preview", 
> "paper-checkbox": "PolymerElements/paper-checkbox#2.0-preview", 
> "paper-toolbar": "PolymerElements/paper-toolbar#2.0-preview".
>
> A the end I have polymer 1.9.1 in my bower folder instead of 2.0.0 rc and 
> so I do not have 
> *polymer.element.htm*l which is required for class-based elements.
>
> class MyElement extends Polymer.Element 
>
>
> Do you have a explanation or a solution for this issue?
>
>
> Thanks.
>
>
> Laurent
>
>
>
>
>
>

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