cron Error: bad username; while reading /etc/cron.d file on LinuxnixCraft

I am getting the following error in my cron job log file /var/log/cron.log:        Aug 22 01:59:01 server2 cron[7510]: Error: bad username; while reading /etc/cron.d/backups I have job entry as follows to run a job at 00:50 every day for root user:        50 0 * * * /etc/cron.d/backups How do I fix this problem on Linux or Unix-like system?