error message "NSPOSIXErrorDomain 1"

Okay, there are a lot of possibilities to see this error. But nevertheless in this case I am helpless. SyncTime shows up:

Heute, 21:09:38
DATEN > DATEN 2

Fehler beim Durchsuchen von /Volumes/DATEN 2 sync/.Spotlight-V100
Der Vorgang konnte nicht abgeschlossen werden. Der Vorgang ist nicht zugelassen
NSPOSIXErrorDomain 1

I tried to fix it by reindexing the regarding volume. Failed.

Any ideas how I can get rid of this problem?

Kind regards Ernst

I think there is some confusion here. Syncthing has nothing to do with “SyncTime”.

Oups! I came here via a link that suggested SyncTime support here. So sorry!