Error Generating /etc/rndc.key:

Try using

rndc-confgen -a -r /dev/urandom

If you're using bind-chroot, add :

rndc-confgen -a -r /dev/urandom -t /var/named/chroot

The result should be:

wrote key file "/etc/rndc.key"

wrote key file "/var/named/chroot/etc/rndc.key"