Calendar Etar add no CalDAV and no EteSync instead crashes

Used with first installation Fairphone 4 from February.

Any suggestions?

Regain your privacy! Adopt /e/ the unGoogled mobile OS and online servicesphone

Could you please explain better. There is no context.
Maybe see this…

[HOWTO] Use the Account Manager - eOSWiki / HOWTOs - /e/OS community

EteSync works with an EteSync account or your own self-hosted EteSync server/instance. Not sure how that relates to /e/.

Sorry for the long interruption.
I want to add a CalDAV address for calendars.

Calendar from