Cannot open /var/log/sa/sa07: No such file or directory

After installing sar I cannot run "sar -q" to get the output. I have waited few hours and still the same error.
Below is the error that I receive :

root@server [~]# sar -q
Cannot open /var/log/sa/sa08: No such file or directory
root@server [~]#

Solution :
Most probably its because of the cron.
First check if service cron is running.

/etc/init.d/crond status

If not restart that

/etc/init.d/crond restart
/etc/init.d/syslog restart