Failed to load resource

Hi,
after upgrading from J3 to J4 I get the error 
Failed to load resources   ../index.php?option=com_osservicesbooking&tmpl=component&no_html=1&task=ajax_loadServices&year=2023&month..................
when I cange the day on the calendar.

Any suggestion for me?
OSSB 2.19.1

Thanks
 

Hi Claudio,
With this kind of issue, you should submit ticket on category: OS Services Booking, and i will check the problem for you
Thanks
Dam