JS-скрипт выдает ошибку сайта о недопустимом способе доставки

var address = "1240 Loma Vista Dr";

document.getElementById("shipping:street1").value = address;
function sleep(ms) {
  return new Promise(resolve => setTimeout(resolve, ms));
}

async function demo() {
  console.info('Taking a break...');
  await sleep(2000);
  console.info('Two seconds later');
}
document.getElementsByClassName("continue button")[1].click();

<button type = "button" class = "continue button validation-passed" title = "Save and Continue" onclick = "shipping.save();saveBilling();"><span><span>Save and Continue</span></span></button>