joplin sync nextcloud

I am using Joplin for Desktop for Mac (Copyright) © 2016-2024 Laurent Cozic

After synchronizing to Nextcloud, Joplin 2.13.15 (prod, Darwin) only has two options under "Notebook" in the Joplin panel: "All Notes" and "Conflict". All the previously created notes in all the notes are gone. What should I do now