I have these two entries in my calendar config
Onmastici italiani
festività
but not the parser seem to not to able to parse .ics content

29.11.2021 10:08.44.032] [ERROR] Calendar Error. Could not fetch calendar:  https://www.webcal.guru/it-IT/scarica_calendario?calendar_instance_id=273 TypeError│··················································
: event.uid.indexOf is not a function                                                                                                                           │··················································
    at /home/pi/MagicMirror/modules/default/calendar/calendarutils.js:157:19                                                                                    │··················································
    at Array.forEach (<anonymous>)                                                                                                                              │··················································    at Object.filterEvents (/home/pi/MagicMirror/modules/default/calendar/calendarutils.js:142:24)                                                              │··················································
    at /home/pi/MagicMirror/modules/default/calendar/calendarfetcher.js:74:29                                                                                   │··················································
    at processTicksAndRejections (internal/process/task_queues.js:93:5)                                                                                         │··················································
[29.11.2021 10:08.44.146] [ERROR] Calendar Error. Could not fetch calendar:  https://www.webcal.guru/it-IT/scarica_calendario?calendar_instance_id=66 TypeError:│··················································
 event.uid.indexOf is not a function                                                                                                                            │··················································
    at /home/pi/MagicMirror/modules/default/calendar/calendarutils.js:157:19                                                                                    │··················································
    at Array.forEach (<anonymous>)                                                                                                                              │··················································
    at Object.filterEvents (/home/pi/MagicMirror/modules/default/calendar/calendarutils.js:142:24)                                                              │··················································
    at /home/pi/MagicMirror/modules/default/calendar/calendarfetcher.js:74:29                                                                                   │··················································
    at processTicksAndRejections (internal/process/task_queues.js:93:5)            

both URLs pass checks at https://icalendar.org
Do you have any suggestions ?
Thanks

@totof60 Thank you. Now it works.

I have no output in my MagicMirror and no error in log file. I tried a curl and the output it’s ok.

curl -H "x-rapidapi-host: coronavirus-monitor.p.rapidapi.com" -H "x-rapidapi-key: mykey"  'https://coronavirus-monitor.p.rapidapi.com/coronavirus/cases_by_country.php'

This is my config:

{
   module: 'MMM-COVID19',
   config: {
       position: 'top_center',
     updateInterval: 300000,
     worldStats: true,
     countries: [  "Italy" ],
     headerRowClass: "small",
     rapidapiKey : "my api key" 
   }
 },

Any suggestion ?