Nextcloud: Notes, attention, possible sensitivity clash with notes

I do not have any files in notes folder, anyone knows why I am getting error:

“Notes, attention, possible sensitivity clash with notes /Volumes/DATA-01/NEXTCLOUD/Notes”

Desktop: MacOS 10.11.6
Server: Debian 9 | Apache 2.4 | MariaDB
Nextcloud: Version 12.0.5