Hi Nicola! Your product is awesome. I tried to change something. I would like to select workers first, and then select the service. I tried to change up in the HTML file, first there was no problem, but after that I always get this error message: jquery.js?ver=1.12.4:4 GET https://premiumautomoso.hu/wp-admin/admin-ajax.php?location=1&service=13&worker=2&date=2019-03-12&end_date=2019-03-12&start=16%3A00&check=77925b7e9e&action=ea_res_appointment 400 (BAD REQUEST) Can u help me with this? Thanks, Balint