CRON - NOT WORKING FAILED to authorize user with PAM (Module is unknown)

Scenario: After I install and update some modules,I notice that my CRON is not working anymore and receive message.

FAILED to authorize user with PAM (Module is unknown)

After I google the message I found the restarting the CRON Service will made the miracle..

# /etc/init.d/crond restart
or
# services crond restart

TIPS: In every time you made update on you system, please find a time to reboot your system.