I worked a little more on the issue and it seems to be a user error,
respectively a cryptic error message.
The new Kontact does not automatically import the old calendars since it
apparently uses a new storage model. It however starts wit some default
calendar, which is marked read only by default. So any attempt to import
calendars or create new events must fail.
What might stay as a bug is that it also fails to import the .ics files
as new calendars, but you can create your own and import the .ics into it.
Regards,
- lars.
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