Unable to enable the adaptive firewall: No ALTQ support in kernel ALTQ related functions disabled

No ALTQ support in kernel ALTQ related functions disabled

OS X Server: How to enable the adaptive firewall - Apple Support

Recently ran the latest OS X Yosemite Server Updates: OS X v10.10.3 and Server v4.1. Tried to enable the "adaptive firewall" by following the steps in Apple's article (see above) and encountered the error after the second line of commands

Charlie$ sudo pfctl -f /etc/pf.conf
pfctl: Use of -f option, could result in flushing of rules
present in the main ruleset added by the system at startup.
See /etc/pf.conf for further details.

No ALTQ support in kernel
ALTQ related functions disabled

server:~ Charlie$