Die Synchronisation bricht ab

Hallo

habe grade das Tool installiert, leider bricht die Synchronisation mit der nachfolgenden Meldung ab.
Was kann das Problem sein ?

Mit freundlichen Grüßen

debug: Already normalized: '/caldav/xxxxxxxxxx/x-apple-reminderkit%3A/REMCDReminder/F9FB3EE9-BAA8-4479-88F1-E766B0B7C3A4.ics'
debug: Skipping '/caldav/xxxxxxxxxx/x-apple-reminderkit%3A/REMCDReminder/F9FB3EE9-BAA8-4479-88F1-E766B0B7C3A4.ics', properties are missing.
error: Unknown error occurred for karsten_calendar/xxxxxxxxxx: /caldav/xxxxxxxxxx/x-apple-reminderkit%3A//REMCDReminder/F9FB3EE9-BAA8-4479-88F1-E766B0B7C3A4.ics
error: Use `-vdebug` to see the full traceback.
debug:   File "/root/.local/share/pipx/venvs/vdirsyncer/lib/python3.13/site-packages/vdirsyncer/cli/tasks.py", line 74, in sync_collection
debug:     await sync.sync(
debug:     ...<7 lines>...
debug:     )
debug:   File "/root/.local/share/pipx/venvs/vdirsyncer/lib/python3.13/site-packages/vdirsyncer/sync/__init__.py", line 150, in sync
debug:     b_nonempty = await b_info.prepare_new_status()
debug:                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
debug:   File "/root/.local/share/pipx/venvs/vdirsyncer/lib/python3.13/site-packages/vdirsyncer/sync/__init__.py", line 69, in prepare_new_status
debug:     async for href, item, etag in self.storage.get_multi(prefetch):
debug:     ...<4 lines>...
debug:         self.set_item_cache(item.ident, item)
debug:   File "/root/.local/share/pipx/venvs/vdirsyncer/lib/python3.13/site-packages/vdirsyncer/storage/dav.py", line 551, in get_multi
debug:     raise exceptions.NotFoundError(href)
error: Unknown error occurred for karsten_calendar/Y2FsOi8vMC82OQ: Server disconnected
error: Use `-vdebug` to see the full traceback.
debug:   File "/root/.local/share/pipx/venvs/vdirsyncer/lib/python3.13/site-packages/vdirsyncer/cli/tasks.py", line 74, in sync_collection
debug:     await sync.sync(
debug:     ...<7 lines>...
debug:     )
debug:   File "/root/.local/share/pipx/venvs/vdirsyncer/lib/python3.13/site-packages/vdirsyncer/sync/__init__.py", line 150, in sync
debug:     b_nonempty = await b_info.prepare_new_status()
debug:                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
debug:   File "/root/.local/share/pipx/venvs/vdirsyncer/lib/python3.13/site-packages/vdirsyncer/sync/__init__.py", line 69, in prepare_new_status
debug:     async for href, item, etag in self.storage.get_multi(prefetch):
debug:     ...<4 lines>...
debug:         self.set_item_cache(item.ident, item)
debug:   File "/root/.local/share/pipx/venvs/vdirsyncer/lib/python3.13/site-packages/vdirsyncer/storage/dav.py", line 520, in get_multi
debug:     response = await self.session.request(
debug:                ^^^^^^^^^^^^^^^^^^^^^^^^^^^
debug:         "REPORT", "", data=data, headers=self.session.get_default_headers()
debug:         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
debug:     )
debug:     ^
debug:   File "/root/.local/share/pipx/venvs/vdirsyncer/lib/python3.13/site-packages/vdirsyncer/storage/dav.py", line 411, in request
debug:     return await http.request(method, url, session=session, **more)
debug:            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
debug:   File "/root/.local/share/pipx/venvs/vdirsyncer/lib/python3.13/site-packages/vdirsyncer/http.py", line 199, in request
debug:     response = await session.request(method, url, headers=headers, **kwargs)
debug:                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
debug:   File "/root/.local/share/pipx/venvs/vdirsyncer/lib/python3.13/site-packages/aiohttp/client.py", line 779, in _request
debug:     resp = await handler(req)
debug:            ^^^^^^^^^^^^^^^^^^
debug:   File "/root/.local/share/pipx/venvs/vdirsyncer/lib/python3.13/site-packages/aiohttp/client.py", line 757, in _connect_and_send_request
debug:     await resp.start(conn)
debug:   File "/root/.local/share/pipx/venvs/vdirsyncer/lib/python3.13/site-packages/aiohttp/client_reqrep.py", line 539, in start
debug:     message, payload = await protocol.read()  # type: ignore[union-attr]
debug:                        ^^^^^^^^^^^^^^^^^^^^^
debug:   File "/root/.local/share/pipx/venvs/vdirsyncer/lib/python3.13/site-packages/aiohttp/streams.py", line 703, in read
debug:     await self._waiter

Reproduce the synchronization failure with -vdebug, then start by reading vdirsyncer/storage/dav.py around get_multi and request, followed by vdirsyncer/sync/__init__.py and vdirsyncer/http.py in the traceback. Compare the missing-properties, NotFoundError, and disconnected-server paths; done means the reported synchronization completes without these errors.