System libraries that pfctl relies on were updated to a version incompatible with the running kernel.

If the binary itself is incompatible, you must ensure both the kernel and world (userland) are on the same version.

When you see this error, it means is trying to communicate with a kernel version of PF that it does not recognize or support. This most commonly happens after a partial system update where the operating system's kernel was updated, but the userland tools were not (or vice-versa). Common Causes

Ensure you are not mixing "stable" userland binaries with a "current" kernel (or vice versa). 3. Rebuild PF Control Tools