KOrganizer hangs at 'Fetching collections'

[John Scott]

Hello,

My CalDAV calendar hasn't been syncing up right in a while, and I think I now 
have a clue why. I noticed it hanging at 'Fetching collections,' so I ran 
akonadictl restart and got the output I've attached. What stands out to me is:
The incidence didn't have any UID! Report a bug  to the application that 
generated this file.

Maybe it's related to this bug (https://bugs.kde.org/show_bug.cgi?id=411777) 
because I have tried importing several .ics files before, though I don't know 
the difference between VCS and ICS.

If this bug is the cause of my troubles, how can I find the UID-less culprit 
and work around it?

Thanks,
John Scott
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org.kde.pim.akonadiserver: "Cannot connect to agent instance with identifier 'akonadi_davgroupware_resource_0', error message: ''"
[SASL-XOAUTH2] - Requesting authID![SASL-XOAUTH2] - Requesting token
![SASL-XOAUTH2] - filling prompts
![SASL-XOAUTH2] - Requesting authID![SASL-XOAUTH2] - Requesting token
!org.kde.pim.kcalcore: The incidence didn't have any UID! Report a bug  to the application that generated this file.

parse error from icalcomponent_new_from_string. string= "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n<d:error xmlns:d=\"DAV:\" xmlns:s=\"http://sabredav.org/ns\">\n  <s:exception>Sabre_DAV_Exception_NotFound</s:exception>\n  <s:message>Calendar object not found</s:message>\n</d:error>\n"
org.kde.pim.davresource: DavGroupwareResource::onItemFetched: Failed to parse item data.  "https://posteo.de:8843/calendars/jscott/default/1575419684.R271.ics"
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