"npfctl validate" error non-message

[Hauke Fath <hf%spg.tu-darmstadt.de@localhost>]

After a context-free

# npfctl validate /etc/npf.conf
npfctl: address family mismatch
#

from 
<https://github.com/rmind/npf/blob/master/src/npfctl/npf_bpf_comp.c>#347, 
where in the ruleset would I start looking?

Cheerio,
hauke

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