title: Uncaught DOMException: Failed to execute 'define' on 'CustomElementRegistry': this name has already been used with this registry
body: <p>Uncaught DOMException: Failed to execute 'define' on 'CustomElementRegistry': this name has already been used with this registry
      at <a href="http://127.0.0.1:8000/components/@polymer/polymer/lib/elements/dom-module.js:175:16" rel="noreferrer">http://127.0.0.1:8000/components/@polymer/polymer/lib/elements/dom-module.js:175:16</a></p>
  
  <p>Tried deleting node-modules and package-lock and reinstalling did not work.</p>