https://wordpress.org/support/topic/publishing-failed-error-message-the-response-is-not-a-valid-json-response-2/
// - solution permalink -> broken
// - permalink broken : https://wordpress.org/support/topic/permalinks-change-breaks-all-links/
// - solution classic editor -> ok
add_action('admin_menu', 'ink_menu_page');
function ink_menu_page() {
add_menu_page('GM', 'Google Map', 'manage_options', 'gm_setting', 'ink_gm_setting', '', 120);
}
function ink_gm_setting(){
?>
Google Map