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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
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Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): 26.0.2
Operating system and version (eg, Ubuntu 20.04): Arch Linux
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.57
PHP version (eg, 7.4): 8.2.2
The issue you are facing:
I’m running a self-hosted installation of Nextcloud. Calendar, Contacts, Tasks, and Talk all work and sync from my phone (Android). But I recently installed the Nextcloud Notes app (v. 4.0.0) and it will not sync, consistently giving a synchronization failed error (complete output below).
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Install Nextcloud Notes.
- Add account (my regular calendar, etc. account)
- Touch + to add a new note.
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'datadirectory' => '/var/lib/nextcloud/data',
'logfile' => '/var/log/nextcloud/nextcloud.log',
'apps_paths' =>
array (
0 =>
array (
'path' => '/usr/share/webapps/nextcloud/apps',
'url' => '/apps',
'writable' => false,
),
1 =>
array (
'path' => '/var/lib/nextcloud/apps',
'url' => '/wapps',
'writable' => true,
),
),
'instanceid' => '********',
'passwordsalt' => '********',
'secret' => '********',
'trusted_domains' =>
array (
0 => 'nextcloud.my.domain',
0 => 'calendar.my.domain',
),
'dbtype' => 'pgsql',
'version' => '26.0.2.1',
'overwrite.cli.url' => 'https://nextcloud.my.domain',
'dbname' => 'nextcloud',
'dbhost' => 'localhost:5432',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'myuser',
'dbpassword' => '********',
'installed' => true,
'theme' => '',
'loglevel' => 2,
'maintenance' => false,
);
Error message on Android:
App Version: 4.0.0
App Version Code: 40000090
App Flavor: fdroid
Files App Version Code: 30250090
---
OS Version: 4.19.110-perf+(a098bfbf1e)
OS API Level: 30
Device: OnePlus8Pro
Manufacturer: OnePlus
Model (and Product): IN2023 (OnePlus8Pro_EEA)
---
java.lang.Exception: {"errorType":"OCP\\Files\\NotPermittedException"}
at it.niedermann.owncloud.notes.persistence.NotesServerSyncTask.pushLocalChanges(NotesServerSyncTask.java:158)
at it.niedermann.owncloud.notes.persistence.NotesServerSyncTask.run(NotesServerSyncTask.java:94)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:462)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:923)
java.lang.Exception: {"errorType":"OCP\\Files\\NotPermittedException"}
at it.niedermann.owncloud.notes.persistence.NotesServerSyncTask.pushLocalChanges(NotesServerSyncTask.java:158)
at it.niedermann.owncloud.notes.persistence.NotesServerSyncTask.run(NotesServerSyncTask.java:94)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:462)
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:923)
