I'm facing this issue while running polymer init on polymer-cli.
Uncaught DOMException: Failed to execute 'define' on 'CustomElementRegistry'
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jimmont
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navnit kapadiya
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3can you post a bit more info? some code? – DVM Jun 12 '17 at 11:07
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1@navnit-kapadiya: Please read [how to ask a good question](https://stackoverflow.com/help/how-to-ask) and include a [MCVE] – Our Man in Bananas Aug 22 '18 at 14:39
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Please use correct English in the question. It is quite confusing. Although I've answered your question, I still suggest you to improve your question for people to understand. – Furqan Rahamath Jan 02 '19 at 11:23
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see answer for the same error at https://stackoverflow.com/a/57696496/965666 – jimmont Aug 28 '19 at 16:20
3 Answers
16
Possible reasons:
- Element name starts with uppercase alphabet
- Element name does not have a hyphen in it (Thanks to Margherita Lazzarini)
Long story:
I was working with polymer CLI and when I ran polymer init, among the series of options it asks me, one of them was Main element name for which I entered Polymer-test-element.
It was giving me this error : Uncaught DOMException: Failed to execute 'define' on 'CustomElementRegistry': "Polymer-test-element" is not a valid custom element name
The problem was I had used an uppercase alphabet in the declared element name. So when I replaced 'P' with 'p' it resolved the issue.
Hope this helps you :)
Furqan Rahamath
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Probably you have defined a Custom Element without a hypen (-) in its name.
See this answer
Margherita Lazzarini
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Check your import, maybe you imported an element with e.g.
<link rel="import" href="../../bower_components/iron-icons/av-icons.html">
instead of
<link rel="import" href="../iron-icons/av-icons.html">
which could both be a valid path but the first one got me the DOMException.
toto11
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