function flashError(message) {
  const new_flash_error = document.createElement('p');
  new_flash_error.classList.add("alert");
  new_flash_error.classList.add("alert-danger");
  new_flash_error.classList.add("alert-dismissible");
  new_flash_error.classList.add("fade");
  new_flash_error.classList.add("show");
  new_flash_error.setAttribute("role", "alert");
  new_flash_error.innerHTML = `${message} <button class=\"btn-close\" type=\"button\" data-bs-dismiss=\"alert\" aria-label=\"Close\" />`;
  const flash = document.querySelectorAll('.flash')[0].appendChild(new_flash_error);
}