Visual SDK - Getting Started Tutorial

[AlessandroN]

Hi, I'm new to Polymer and I'm trying to create my first widget using the Visual SDK.
When I try to launch polymer from the simple-el folder, it doesn't give me the correct output on the browser (Chrome) (attached page1.PNG).
Opening the inspector, the console shows this error: 

Uncaught DOMException: Failed to execute 'define' on 'CustomElementRegistry': the name "dom-module" has already been used with this registry
    at http://127.0.0.1:8081/components/@polymer/polymer/lib/elements/dom-module.js:176:16

I think it is a problem due to a library conflict on npm (d3-array), but I'm not sure about it.
There's anyone who has already faced this issue? 

[slangley]

Hi @AlessandroN.

Can you clarify that you're referring to the Web Component SDK?  What version of ThingWorx are you running?

There was a conflict with the d3 JS in ThingWorx 9.0 but it was corrected in 9.0.2 and 9.1.

Regards.

--Sharon

[AlessandroN · Accepted solution]

Hi, I solved in the most simple way ever...following the guide.
The command:

> polymer serve --open

 Automatically redirects on a bad path that is different from the one explained in the guide.

The correct one was:

http://127.0.0.1:<port_number>/demo/