How can I return an error message when updating user meta?

Question

// User Settings Errors
add_filter( 'user_profile_update_errors', 'my_plugin_user_settings_errors' );
function my_plugin_user_settings_errors( $errors ) {
  $user_level = intval( $_POST[ 'my-plugin-user-level' ] );
  if ( ! is_int( $user_level ) || $user_level < 0 || $user_level > 50 ) {
    $errors->add( 'my-plugin-invalid-admin-level', '<strong>ERROR:</strong> User Level must be between 0 and 50.' );
  }
  return $errors;
}