run-parts: /etc/cron.daily/60sa-update exited with return code 4

I get this error message in a mail with subject "Cron <root@dev2> test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily )"

This file looks like this:

#!/bin/bash

### Copyright 1999-2017. Parallels IP Holdings GmbH. All Rights Reserved.


sa_update()

{

/usr/bin/sa-update

local rc="$?"

case $rc in

# Only restart spamd if sa-update returns 0, meaning it updated the rules

0) env...

run-parts: /etc/cron.daily/60sa-update exited with return code 4