app.ERROR: [404]: Sabre\DAV\Exception\NotFound - Node

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Hello,

I'm facing a problem with the synchronization from with mobile (android / mac) devices. Every time the calendar is synchronized, the following error occurs within the log file (/davis/var/log/prod.log). Nevertheless all entries are synchronized. I'm guessing about a "old"/"dead" node?

[2024-10-16T10:03:31.710596+02:00] app.ERROR: [404]: Sabre\DAV\Exception\NotFound - Node with name '1ba2594f-8a77-4c83-91d4-b1d652ad9fda' could not be found
[{"file":"/var/www/html/davis/vendor/sabre/dav/lib/DAV/Tree.php","line":78,"function":"getChild","class":"Sabre\\CalDAV\\CalendarHome","type":"->"},
{"file":"/var/www/html/davis/vendor/sabre/dav/lib/DAV/Server.php","line":971,"function":"getNodeForPath","class":"Sabre\\DAV\\Tree","type":"->"},
{"file":"/var/www/html/davis/vendor/sabre/dav/lib/DAV/Server.php","line":1662,"function":"getPropertiesIteratorForPath","class":"Sabre\\DAV\\Server","type":"->"},
{"file":"/var/www/html/davis/vendor/sabre/dav/lib/DAV/Server.php","line":1647,"function":"writeMultiStatus","class":"Sabre\\DAV\\Server","type":"->"},
{"file":"/var/www/html/davis/vendor/sabre/dav/lib/DAV/CorePlugin.php","line":346,"function":"generateMultiStatus","class":"Sabre\\DAV\\Server","type":"->"},
{"file":"/var/www/html/davis/vendor/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"httpPropFind","class":"Sabre\\DAV\\CorePlugin","type":"->"},
{"file":"/var/www/html/davis/vendor/sabre/dav/lib/DAV/Server.php","line":472,"function":"emit","class":"Sabre\\DAV\\Server","type":"->"},
{"file":"/var/www/html/davis/vendor/sabre/dav/lib/DAV/Server.php","line":253,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->"},
{"file":"/var/www/html/davis/src/Controller/DAVController.php","line":305,"function":"start","class":"Sabre\\DAV\\Server","type":"->"},
{"file":"/var/www/html/davis/vendor/symfony/http-kernel/HttpKernel.php","line":163,"function":"dav","class":"App\\Controller\\DAVController","type":"->"},
{"file":"/var/www/html/davis/vendor/symfony/http-kernel/HttpKernel.php","line":75,"function":"handleRaw","class":"Symfony\\Component\\HttpKernel\\HttpKernel","type":"->"},
{"file":"/var/www/html/davis/vendor/symfony/http-kernel/Kernel.php","line":202,"function":"handle","class":"Symfony\\Component\\HttpKernel\\HttpKernel","type":"->"},
{"file":"/var/www/html/davis/public/index.php","line":28,"function":"handle","class":"Symfony\\Component\\HttpKernel\\Kernel","type":"->"}
] []

Here is the error from OpenSync Android App:

<?xml version='1.0' encoding='UTF-8' ?><propfind xmlns="DAV:" xmlns:CAL="urn:ietf:params:xml:ns:caldav" xmlns:CARD="urn:ietf:params:xml:ns:carddav"><prop><n0:getctag xmlns:n0="http://calendarserver.org/ns/" /></prop></propfind>

HTTP RESPONSE:
http/1.1 404 Not Found
Cache-Control: max-age=0, must-revalidate, private
Connection: keep-alive
Content-Type: application/xml; charset=utf-8
Date: Tue, 15 Oct 2024 12:09:43 GMT
DAV: 1, 3, extended-mkcol, access-control, calendarserver-principal-property-search, resource-sharing, calendar-access, calendar-proxy, calendar-auto-schedule, calendar-availability, calendarserver-sharing
Expires: Tue, 15 Oct 2024 12:09:43 GMT
Server: nginx/1.18.0
Strict-Transport-Security: max-age=31536000
Transfer-Encoding: chunked
Vary: Brief,Prefer
X-Sabre-Version: 4.4.0

<?xml version="1.0" encoding="utf-8"?>[LF]
<d:error xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns">[LF]
  <s:sabredav-version>4.4.0</s:sabredav-version>[LF]
  <s:exception>Sabre\DAV\Exception\NotFound</s:exception>[LF]
  <s:message>Node with name 'bb1392cd-d0f5-481c-b6d7-fa3398f547a7' could not be found</s:message>[LF]
</d:error>[LF]


EXCEPTION:
at.bitfire.dav4android.exception.NotFoundException: 404 Not Found
	at at.bitfire.dav4android.DavResource.checkStatus(DavResource.java:317)
	at at.bitfire.dav4android.DavResource.checkStatus(DavResource.java:298)
	at at.bitfire.dav4android.DavResource.propfind(DavResource.java:283)
	at com.deependhulla.opensync.syncadapter.CalendarSyncManager.queryCapabilities(CalendarSyncManager.java:91)
	at com.deependhulla.opensync.syncadapter.SyncManager.performSync(SyncManager.java:142)
	at com.deependhulla.opensync.syncadapter.CalendarsSyncAdapterService$SyncAdapter.onPerformSync(CalendarsSyncAdapterService.java:70)
	at android.content.AbstractThreadedSyncAdapter$SyncThread.run(AbstractThreadedSyncAdapter.java:354)

SOFTWARE INFORMATION
OpenSync version: 1.5.0.3-ose (145) Tue Apr 18 09:03:24 GMT+02:00 2017
Installed from: com.google.android.packageinstaller
JB Workaround installed: no

CONFIGURATION
Power saving disabled: no
android.permission.READ_CONTACTS permission: denied
android.permission.WRITE_CONTACTS permission: denied
android.permission.READ_CALENDAR permission: granted
android.permission.WRITE_CALENDAR permission: granted
org.dmfs.permission.READ_TASKS permission: denied
org.dmfs.permission.WRITE_TASKS permission: denied
System-wide synchronization: automatically

Davis v4.0.0
SabreDav v4.4.0

I know there is already Davis v5.2.0 and SabreDav v4.5.0 but I couldn't really find any changes which belong to this error.

If I look through all nodes within the sabre/dav interface I couldn't find the mentioned missing node.

Does anyone know what could cause this problem?