Stripe not working with error 'Uncaught (in promise) Error: We could not retrieve data from the specified Element.'

I am trying to use Stripe.js following https://stripe.com/docs/stripe-js/elements/quickstart

I made html, css, javascript just same as sample of that url.

But when I click 'Submit Payment' Button, it always shows console error and not working.

(index):1 Uncaught (in promise) Error: We could not retrieve data from the specified Element.
              Please make sure the Element you are attempting to use is still mounted.
    at new t ((index):1)
    at e._handleMessage ((index):1)
    at e._handleMessage ((index):1)
    at (index):1

Please let me know why this happens.

from Stripe not working with error 'Uncaught (in promise) Error: We could not retrieve data from the specified Element.'