[bug?] Lineageos 16 Android 9 Davx5 not syncing tasks

[user-name]

Hello,
after upgrading from Lineage 15 to 16 and upgrading from Davdroid to Davx5 simultaneously I cant sync tasks from my nextcloud anymore. Contacts and calendar events are fine and it also synced the name and colours of my task lists. The actual content, however, was missing. Each attempt to sync would end in a notification of a

java.lang.ClassCastException: net.fortuna.ical4j.model.property.XProperty cannot be cast to net.fortuna.ical4j.model.property.Uid

for each task list.

I fixed my issue by downgrading the app to version 2.0.7 and attached the debug.txt, hoping it may solve to fix the described issues (since I think I didn’t miss any steps like granting permissions etc - please correct me if I’m wrong)

--- BEGIN DEBUG INFO ---
Account name: XXXX
Authority: com.android.calendar

REMOTE RESOURCE:
https://nextcloud.XXXX/remote.php/dav/calendars/XXXX/sonstiges-1/54b9155f-3c3b-4425-bd39-41c43af09b4b.ics

EXCEPTION:
java.lang.ClassCastException: net.fortuna.ical4j.model.property.XProperty cannot be cast to net.fortuna.ical4j.model.property.Uid
	at net.fortuna.ical4j.model.component.VEvent.getUid(VEvent.java:671)
	at at.bitfire.ical4android.Event$Companion.fromReader(Event.kt:95)
	at at.bitfire.ical4android.Event$Companion.fromReader$default(Event.kt:72)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager.processVEvent(CalendarSyncManager.kt:159)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager.access$processVEvent(CalendarSyncManager.kt:41)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager$downloadRemote$2$1$1.invoke(CalendarSyncManager.kt:144)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager$downloadRemote$2$1$1.invoke(CalendarSyncManager.kt:41)
	at at.bitfire.davdroid.syncadapter.SyncManager.useRemote(SyncManager.kt:794)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager$downloadRemote$2$1.invoke(CalendarSyncManager.kt:131)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager$downloadRemote$2$1.invoke(CalendarSyncManager.kt:41)
	at at.bitfire.dav4android.Response$Companion.parse(Response.kt:211)
	at at.bitfire.dav4android.DavResource$processMultiStatus$2.invoke(DavResource.kt:465)
	at at.bitfire.dav4android.DavResource.processMultiStatus(DavResource.kt:484)
	at at.bitfire.dav4android.DavResource.processMultiStatus(DavResource.kt:435)
	at at.bitfire.dav4android.DavCalendar.multiget(DavCalendar.kt:151)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager$downloadRemote$2.invoke(CalendarSyncManager.kt:130)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager$downloadRemote$2.invoke(CalendarSyncManager.kt:41)
	at at.bitfire.davdroid.syncadapter.SyncManager.useRemote(SyncManager.kt:783)
	at at.bitfire.davdroid.syncadapter.SyncManager.useRemoteCollection(SyncManager.kt:804)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager.downloadRemote(CalendarSyncManager.kt:129)
	at at.bitfire.davdroid.syncadapter.SyncManager$syncRemote$1$1.run(SyncManager.kt:447)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:458)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
	at java.lang.Thread.run(Thread.java:764)

SOFTWARE INFORMATION
* at.bitfire.davdroid 2.1-ose (257) from org.fdroid.fdroid.privileged
* org.dmfs.tasks 1.1.15 (7330) from org.fdroid.fdroid.privileged
* com.android.providers.contacts 9 (28)
* com.android.providers.calendar 9 (28)
* com.android.contacts 1.7.31 (10731)
* ws.xsoh.etar 1.0.13 (15) from org.fdroid.fdroid.privileged

CONNECTIVITY (at the moment)
Active connection: WiFi, CONNECTED

CONFIGURATION
Power saving disabled: yes
android.permission.READ_CONTACTS permission: granted
android.permission.WRITE_CONTACTS permission: granted
android.permission.READ_CALENDAR permission: granted
android.permission.WRITE_CALENDAR permission: granted
org.dmfs.permission.READ_TASKS permission: granted
org.dmfs.permission.WRITE_TASKS permission: granted
System-wide synchronization: automatically
Account: XXXX
  Address book sync. interval: 1440 min
  Calendar     sync. interval: 60 min
  OpenTasks    sync. interval: 60 min
  WiFi only: false
  [CardDAV] Contact group method: GROUP_VCARDS
  [CalDAV] Time range (past days): 360
           Manage calendar colors: true
Address book account: Kontakte (XXXX VA)
  Main account: Account {name=XXXX, type=bitfire.at.davdroid}
  URL: https://nextcloud.XXXX/remote.php/dav/addressbooks/users/XXXX/contacts/
  Sync automatically: true

SQLITE DUMP
android_metadata
	|  locale |
	|  en_GB |
----------
services
	|  _id | accountName | service | principal |
	|  1 | XXXX | carddav | https://nextcloud.XXXX/remote.php/dav/principals/users/XXXX/ |
	|  2 | XXXX | caldav | https://nextcloud.XXXX/remote.php/dav/principals/users/XXXX/ |
----------
sqlite_sequence
	|  name | seq |
	|  services | 2 |
	|  homesets | 5 |
	|  collections | 25 |
----------
homesets
	|  _id | serviceID | url |
	|  2 | 1 | https://nextcloud.XXXX/remote.php/dav/addressbooks/users/XXXX/ |
	|  5 | 2 | https://nextcloud.XXXX/remote.php/dav/calendars/XXXX/ |
----------
collections
	|  _id | serviceID | type | url | privWriteContent | privUnbind | forceReadOnly | displayName | description | color | timezone | supportsVEVENT | supportsVTODO | source | sync |
	|  7 | 1 | ADDRESS_BOOK | https://nextcloud.XXXX/remote.php/dav/addressbooks/users/XXXX/contacts/ | 1 | 1 | 0 | Kontakte | <null> | <null> | <null> | 0 | 0 | <null> | 1 |
	|  20 | 2 | CALENDAR | https://nextcloud.XXXX/remote.php/dav/calendars/XXXX/19a73b2b-6027-478c-b57d-4231d851ec45/ | 1 | 1 | 0 | Lesen, Schauen, Hören | <null> | -1579148 | <null> | 0 | 1 | <null> | 1 |
	|  21 | 2 | CALENDAR | https://nextcloud.XXXX/remote.php/dav/calendars/XXXX/6a5236a0-aba8-451a-9a1f-364f845c8425/ | 1 | 1 | 0 | Texte | <null> | -9115694 | <null> | 1 | 1 | <null> | 1 |
	|  22 | 2 | CALENDAR | https://nextcloud.XXXX/remote.php/dav/calendars/XXXX/8615e4c7-4a01-40bc-ada2-c95652c4d7f7/ | 1 | 1 | 0 | Tuxen | <null> | -1608502 | <null> | 0 | 1 | <null> | 1 |
	|  23 | 2 | CALENDAR | https://nextcloud.XXXX/remote.php/dav/calendars/XXXX/personal/ | 1 | 1 | 0 | Calendar1 | <null> | -9139225 | <null> | 1 | 1 | <null> | 1 |
	|  24 | 2 | CALENDAR | https://nextcloud.XXXX/remote.php/dav/calendars/XXXX/sonstiges-1/ | 1 | 1 | 0 | Calendar2 | <null> | -1593996 | <null> | 1 | 1 | <null> | 1 |
	|  25 | 2 | CALENDAR | https://nextcloud.XXXX/remote.php/dav/calendars/XXXX/Calendar3/ | 1 | 1 | 0 | Calendar3 | <null> | -9122585 | <null> | 1 | 1 | <null> | 1 |
----------

SYSTEM INFORMATION
Android version: 9 (lineage_scorpio-userdebug 9 PQ1A.181205.006 c6f7e32574 test-keys)
Device: Xiaomi MI Note 2 (scorpio)

--- END DEBUG INFO ---

best regards

[rfc2822]

Hello,

Does it help to uninstall DAVx⁵ and install it (newest version) again?

[user-name]

Yes, it’s fixed. Thanks!