Activating the sync of the calender makes no change. For easier reading of the logs I only activated the contacts.

No, the local address book is empty. The phone was factory reseted.

I can not found any options for autostart or background start or something like this, but should not work a manual sync always by triggering?

Another interesting point: In comparision to my old device the following lines are missing in the configuration section of the debug infos:

Address book account: Contacts (test_user cA) Main account: Account {name=test_user, type=bitfire.at.davdroid} URL: https://cloud.myDomain.net/remote.php/dav/addressbooks/users/test_user/contacts/ Sync automatically: true

Is the Lineage privacy guard disabled for DAVx⁵?

Here is the report:

--- BEGIN DEBUG INFO --- EXCEPTION: java.lang.RuntimeException: Unable to resume activity {at.bitfire.davdroid/at.bitfire.davdroid.ui.AccountSettingsActivity}: at.bitfire.davdroid.InvalidAccountException: Invalid account: Account {name=USERNAME, type=bitfire.at.davdroid} at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3822) at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3854) at android.app.servertransaction.ResumeActivityItem.execute(ResumeActivityItem.java:51) at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:145) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:70) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1816) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loop(Looper.java:193) at android.app.ActivityThread.main(ActivityThread.java:6718) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) Caused by: at.bitfire.davdroid.InvalidAccountException: Invalid account: Account {name=USERNAME, type=bitfire.at.davdroid} at at.bitfire.davdroid.settings.AccountSettings.<init>(AccountSettings.kt:109) at at.bitfire.davdroid.ui.AccountSettingsActivity$AccountSettingsFragment.reload(AccountSettingsActivity.kt:119) at at.bitfire.davdroid.ui.AccountSettingsActivity$AccountSettingsFragment.onResume(AccountSettingsActivity.kt:98) at androidx.fragment.app.Fragment.performResume(Fragment.java:2649) at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:922) at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManagerImpl.java:1238) at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:1303) at androidx.fragment.app.FragmentManagerImpl.dispatchStateChange(FragmentManagerImpl.java:2659) at androidx.fragment.app.FragmentManagerImpl.dispatchResume(FragmentManagerImpl.java:2625) at androidx.fragment.app.FragmentController.dispatchResume(FragmentController.java:268) at androidx.fragment.app.FragmentActivity.onResumeFragments(FragmentActivity.java:479) at androidx.fragment.app.FragmentActivity.onPostResume(FragmentActivity.java:468) at androidx.appcompat.app.AppCompatActivity.onPostResume(AppCompatActivity.java:195) at android.app.Activity.performResume(Activity.java:7325) at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3814) ... 11 more SOFTWARE INFORMATION * at.bitfire.davdroid 2.6-ose (308) from org.fdroid.fdroid.privileged * org.dmfs.tasks 1.2.3 (77600) from org.fdroid.fdroid.privileged * com.android.providers.contacts 9 (28) * com.android.providers.calendar 9 (28) * com.android.contacts 1.7.31 (10731) * com.android.calendar 9 (28) * ws.xsoh.etar 1.0.18 (20) from org.fdroid.fdroid.privileged CONNECTIVITY (at the moment) - [ Transports: WIFI Capabilities: NOT_METERED&INTERNET&NOT_RESTRICTED&TRUSTED&NOT_VPN&VALIDATED&NOT_ROAMING&FOREGROUND&NOT_CONGESTED&NOT_SUSPENDED Unwanted: LinkUpBandwidth>=1048576Kbps LinkDnBandwidth>=1048576Kbps SignalStrength: -51] CONFIGURATION Power saving disabled: yes android.permission.READ_CONTACTS: granted android.permission.WRITE_CONTACTS: granted android.permission.READ_CALENDAR: granted android.permission.WRITE_CALENDAR: granted org.dmfs.permission.READ_TASKS: granted org.dmfs.permission.WRITE_TASKS: granted android.permission.ACCESS_COARSE_LOCATION: denied System-wide synchronization: automatically Account: USERNAME Nextcloud Address book sync. interval: 240 min Calendar sync. interval: 240 min OpenTasks sync. interval: 240 min WiFi only: false [CardDAV] Contact group method: GROUP_VCARDS [CalDAV] Time range (past days): 90 Manage calendar colors: true Use event colors: false SQLITE DUMP android_metadata | locale | | de_DE | ---------- room_master_table | id | identity_hash | | 42 | a7554d1eb[…]485d63c | ---------- service | id | accountName | type | principal | | 5 | USERNAME Nextcloud | carddav | https://server.example.com:1234/nextcloud/remote.php/dav/principals/users/USERNAME/ | | 6 | USERNAME Nextcloud | caldav | https://server.example.com:1234/nextcloud/remote.php/dav/principals/users/USERNAME/ | ---------- sqlite_sequence | name | seq | | service | 6 | | homeset | 6 | | collection | 12 | ---------- homeset | id | serviceId | url | privBind | displayName | | 5 | 6 | https://server.example.com:1234/nextcloud/remote.php/dav/calendars/USERNAME/ | 1 | <null> | | 6 | 5 | https://server.example.com:1234/nextcloud/remote.php/dav/addressbooks/users/USERNAME/ | 1 | <null> | ---------- collection | id | serviceId | type | url | privWriteContent | privUnbind | forceReadOnly | displayName | description | color | timezone | supportsVEVENT | supportsVTODO | supportsVJOURNAL | source | sync | | 9 | 6 | CALENDAR | https://server.example.com:1234/nextcloud/remote.php/dav/calendars/USERNAME/SOMECAL1/ | 1 | 1 | 0 | NAMEOFCALENDAR1ö | <null> | <null> | <null> | 1 | 1 | 0 | <null> | 0 | | 10 | 6 | CALENDAR | https://server.example.com:1234/nextcloud/remote.php/dav/calendars/USERNAME/SOMECAL2/ | 0 | 0 | 0 | NAME OF CALENDAR 2 | <null> | -54 | <null> | 1 | 0 | 0 | <null> | 0 | | 11 | 6 | WEBCAL | https://server.example.com:1234/nextcloud/remote.php/dav/calendars/USERNAME/httpswww[…]lSOMECAL3ics/ | 1 | 1 | 0 | *** | <null> | -1605516 | <null> | 1 | <null> | <null> | https://www.[…]/static/ical/SOMECAL3.ics | 0 | | 12 | 5 | ADDRESS_BOOK | https://server.example.com:1234/nextcloud/remote.php/dav/addressbooks/users/USERNAME/contacts/ | 1 | 1 | 0 | Kontakte | <null> | <null> | <null> | <null> | <null> | <null> | <null> | 1 | ---------- SYSTEM INFORMATION Android version: 9 (lineage_kiwi-userdebug 9 PQ3A.190801.002 eng.root.20191106.083120 dev-keys) Device: HUAWEI KIW-L21 (kiwi) --- END DEBUG INFO ---

LineageOS 16

STR:

Add Nextcloud account Try to enable “Use event colors”
-> it crashes

Note this happens in conjunction with this other bug, so maybe they are related:
https://forums.bitfire.at/topic/2170/duplicate-calenders-and-no-calender-syncronisation-with-nextcloud

Thank you for your fast response! So the allowBackup setting was a bug, which I saw you already fixed. Thank you!

@Matthias-Laabs said in Does DavDroid preserve RELATED-TO?:

Is there any public demo account for testing purposes with a web interface that supports child tasks?

Hmm, for the desktop there is korganizer and zanshin (both kde applications); these are the ones I use. Nextcloud’s task app supports it, but I do not know whether their public demo allows caldav access. (Did not yet manage to create one myself.)

You’re welcome. Nice that it worked out and thanks for the details of what you did.

Hi!
The only app we know supporting both is acalendar+, because they implemented “Open Tasks”. I don’t think they offer an iPhone version.

Yes, it does - you’re awesome, thank you very much!

Hi I am on ubuntu 19.04 I have the application working via sudo ./networktablet command flawlessly, yet I can make desktop icons for ubuntu, but never had to try with a sudo command or any other command to open an application I am new to linux so confused, after scouring forever looking and trying 10’s of ways I cannot get it to open well it does but as a file to edit in a text editor rather than as a sudo terminal command, I really want gfxtablet incorporated in my custom os so I can open it from an icon but need your help please anyone if you can assist in making the app into a desktop icon for ubuntu would be great.