When the system displays it means:
If the chef (the program) gets upgraded to a newer version of "Packet Filter," they might no longer understand the shorthand or specific terms used in the old recipe book (the configuration). pf configuration incompatible with pf program version
pfctl: /etc/pf.conf: line 1: pf configuration incompatible with pf program version kernel: pf: DIOCXRULES: Inappropriate ioctl for device The Mismatch: If the chef (the program) gets