You should add in your /etc/named.conf file, under options:

options {
...

	zone-statistics yes;
        statistics-file "/var/log/stats.dump" ;
...
}


Then do:

# /etc/init.d/bind9 restart


Now check that user which is executing parse_bind9stat.pl has permission
on /etc/bind/rndc.key by issuing

$ /usr/sbin/rndc stats

as that user. This should create file /var/log/stats.dump.