prototype.registerCallback is not a function in Polymer

Question

I've try to use core-icon and layout element. When I import core-icons.html, there's some error..

Uncaught TypeError: prototype.registerCallback is not a function

and there is any element display on the page.

What should I do to fix it. - Using Polymer 0.9 and Elements (0.5)

Answer 1

Core Elements are not compatible with Polymer 0.9. Use iron-elements instead.