Can't Upload Media Files

CMS Version

4.4.1

Installation
non-docker

Operating System
Linux Debian 13

Installation Method
non-Docker

Issue
Can’t upload Media. Error shown: Unknown Error.

The Log files show:
run: CRON syntax error for taskId 1, e: 6 is not a valid position

The library is outside the web folder and owned and writable by the webuser.

Any idea why I can’t upload and save media files?

Kind regards

Christian