Backup is not working

Hello Team,
I have created a s3 bucket and configured in longhorn ui but still gettting error as below. Can someone help on this.

error listing backups: error listing backup volumes: Failed to execute: /var/lib/longhorn/engine-binaries/harbor-emea.1dc.com-library-longhorn-engine-longhorn-engine-v1.1.1/longhorn [backup ls --volume-only s3://longhorn-backup-emea@eu-central-1/backupstore], output , stderr, , error fork/exec /var/lib/longhorn/engine-binaries/harbor-emea.1dc.com-library-longhorn-engine-longhorn-engine-v1.1.1/longhorn: invalid argument