“Subscribe” are not working

Hi,

I enabled the option to subscribe the calendar in Outlook or Apple calendar. I tried to add the calendar in my Outlook and my iPhone but it’s not working. Some events are displayed and some events are missing.

Also I’ve got error message: “Task ‘Internet Calendar Subscriptions’ reported error (0x00070032) : ‘The VEVENT, “XXX”, defined near line XY, contains a recurrence pattern that Outlook does not support. The appointment has been skipped.’” or “Task ‘Internet Calendar’ reported error (0x0004003D) : ‘The VEVENT, “Event”, defined near line xyz, lacks a DTEND. Outlook is assuming that this appointment is an hour long. Double-click to open this item.’“

I added also the calendar in my Google Account and this works fine for me.
I hope somebody could help me ??

Thanks!