Nextcloud Notes does not synchronize with Android app

[Hominem-Lot]

Hi everyone, I'm a new Nextcloud user and I was looking for a note app like google keep. I installed Nextcloud notes on my Android device to have synchronization but it reports a problem. I'm attaching the report, please let me know if anyone can give me advice on how to solve it. Thanks

App Version: 4.3.1
App Version Code: 40030190
App Flavor: fdroid

Files App Version Code: 30290390 (PROD)

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OS Version: 4.19.278-g7b0944645172-ab10812814(11260668)
OS API Level: 34
Device: redfin
Manufacturer: Google
Model (and Product): Pixel 5 (redfin)

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java.lang.Exception: {"errorType":"RuntimeException"}

 at it.niedermann.owncloud.notes.persistence.NotesServerSyncTask.pushLocalChanges(NotesServerSyncTask.java:164)
 at it.niedermann.owncloud.notes.persistence.NotesServerSyncTask.run(NotesServerSyncTask.java:100)
 at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:487)
 at java.util.concurrent.FutureTask.run(FutureTask.java:264)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:644)
 at java.lang.Thread.run(Thread.java:1012)


java.lang.Exception: {"errorType":"RuntimeException"}

 at it.niedermann.owncloud.notes.persistence.NotesServerSyncTask.pushLocalChanges(NotesServerSyncTask.java:164)
 at it.niedermann.owncloud.notes.persistence.NotesServerSyncTask.run(NotesServerSyncTask.java:100)
 at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:487)
 at java.util.concurrent.FutureTask.run(FutureTask.java:264)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:644)
 at java.lang.Thread.run(Thread.java:1012)