cPanel Permission on “/usr/bin/crontab” are wrong (4755). Please set to 4755.

I am fairly new to Linode and recently I installed cPanel on my Linode. Everything was working fine until I needed to schedule a corn job. Unfortunately, I entered wrong path to the PHP file (to be noted that the cron was setup to execute a tiny PHP script) and then cron section is broken. When i go to cron jobs page, I see a message saying 'Permission on “/usr/bin/crontab” are wrong (4755). Please set to 4755.'. I am sharing the screenshot here:

~~http://image.prntscr.com/image/4c5fbe03 … f657bc.png">http://image.prntscr.com/image/4c5fbe03834e4aedb74e7abd82f657bc.png" />

To be mentioned here, I already have chmod 4755 /usr/bin/crontab from command line still no luck! Please help me how to fix this issue.

Rehmat~~