Archivist cron gives me an error

Yunohost stable an amd64.

I needed to change the directory where the backup files are saved so I changed the file /opt/yunohost/archivist/Backup_list.conf in the lines

# Backup directory.
backup_dir=/var/backups/yunohost.backup/archivist/backup

# Encrypted backup directory.
# Usually just next to the backup directory
enc_backup_dir=/var/backups/yunohost.backup/archivist/encrypted_backup

The permissions of the directory /var/backups/yunohost.backup/ are:

drwxr-x--- 2 admin root 4096 Sep 13 22:43 archives
drwxr-xr-x 4 admin root 4096 Apr 10 02:00 archivist
drwxr-x--- 3 admin root 4096 Aug 28 10:57 premigration
drwxr-x--- 3 admin root 4096 Sep 13 22:32 tmp

But now the cron job of archivist gives me this error:

 Backup YunoHost core and apps
 Make a temporary backup for ynh_core_backup
 Pick a different output directory. Backups cannot be created in /bin, /boot, /dev, /etc, /lib, /root, /run, /sbin, /sys, /usr, /var or /home/yunohost.backup/archives sub-folders