[Vuejs]-Errors while using Vue CLI 4 and A Frame

The answer is that these components in snake case collide with Vue. Vue can’t find those components registered, so you get the error that you do.

The short of it: tell Vue to ignoreElements associated with a frame:

Vue.config.ignoredElements = [
  'a-scene',
  'a-entity',
  'a-camera',
  'a-box',
  'a-sky',
  'a-sphere',
  'a-cylinder',
  'a-plane'
];

The above list isn’t comprehensive, but is a starting point. You can add more to it or subtract from it as you please.