Demo doesn't work and fails with lots of 404

[mvysny]

Running polymer serve won't work and will fail with lots of 404s:

GET http://127.0.0.1:8081/webcomponentsjs/webcomponents-loader.js net::ERR_ABORTED 404 (Not Found)
127.0.0.1/:9 GET http://127.0.0.1:8081/iron-demo-helpers/demo-pages-shared-styles.html 404 (Not Found)
127.0.0.1/:10 GET http://127.0.0.1:8081/iron-demo-helpers/demo-snippet.html 404 (Not Found)
8127.0.0.1/:30 GET http://127.0.0.1:8081/polymer/polymer-element.html net::ERR_ABORTED 404 (Not Found)
calendar-month.html:51 Uncaught ReferenceError: Polymer is not defined
    at calendar-month.html:51
(anonymous) @ calendar-month.html:51
calendar-header.html:32 Uncaught ReferenceError: Polymer is not defined
    at calendar-header.html:32
(anonymous) @ calendar-header.html:32
2(index):30 GET http://127.0.0.1:8081/vaadin-text-field/vaadin-text-field.html net::ERR_ABORTED 404 (Not Found)

I tried to run bower install but even that didn't help. What should I do please?

[mvysny]

Ah, browse the following link: http://127.0.0.1:8081/components/calendar-component/demo/ instead of http://localhost:8081 (dumb me)

[jmvanel]

I did just that,
and did everything like on README,
but, when running polymer serve , the screen appears empty under "Basic calendar-component demo" title.
On Firefox and on Chromium.
I'm on Ubuntu latest.
Is there a special setting to do on the browsers ?

[jmvanel]

OK, it works for me.

I did
bower install --save onuridrisoglu/calendar-component .
and now when running:
polymer serve

URL given on the Linux shell :
http://127.0.0.1:8081/components/calendar-component/`
redirects to
http://127.0.0.1:8081/components/calendar-component/demo/
which did not happen before.

In fact, I realize that the component is hosted on CDN, as we can see by pressing "export to JS-fiddle" in:
https://www.webcomponents.org/element/onuridrisoglu/calendar-component

I think it was with bower install that the directory hosted in the CND was created.
These clarifications should be in the README.