Why crontab is not executing shell script?

Issue

• Why crontab is not executing shell srcipt.
• The shell script works fine when run it manually.
• The crontab file: /etc/crontab looks like:

SHELL=/bin/bash  
PATH=/sbin:/bin:/usr/sbin:/usr/bin  
MAILTO=root@localhost.localdomain  
HOME=/root

\# run-parts  
01 \* \* \* \* root run-parts /etc/cron.hourly  
02 4 \* \* \* root run-parts /etc/cron.daily  
00 0 \* \* \* root yum update -y  
22 04 \* \* 0 root run-parts /etc/cron.weekly  
42 04 01 \* \* root run-parts /etc/cron.monthly  
16 00 \* \* \* root /home/timemanager/www/global\_protected/cron/employee\_import