Failed to start Security Auditing Service with an error "Illegal option email for disk_error_action"

Issue

• Status of the auditd service is as below.

[root@Rhel8 ~]# systemctl status auditd.service
● auditd.service - Security Auditing Service
   Loaded: loaded (/usr/lib/systemd/system/auditd.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Thu 2021-04-08 15:27:39 CEST; 49s ago
     Docs: man:auditd(8)
           https://github.com/linux-audit/audit-documentation
  Process: 1101 ExecStart=/sbin/auditd (code=exited, status=6)

Apr 08 15:27:39 Rhel8 systemd[1]: Starting Security Auditing Service...
Apr 08 15:27:39 Rhel8 auditd[1101]: Illegal option email for disk_error_action - line 25  
Apr 08 15:27:39 Rhel8 auditd[1101]: The audit daemon is exiting.
Apr 08 15:27:39 Rhel8 systemd[1]: auditd.service: Control process exited, code=exited status=6
Apr 08 15:27:39 Rhel8 systemd[1]: auditd.service: Failed with result 'exit-code'.
Apr 08 15:27:39 Rhel8 systemd[1]: Failed to start Security Auditing Service.