[system] error while loading config: ...b/x86_64-linux-gnu/knot-resolver/kres_modules/policy.lua:378: bad argument #1 to 'create' (table expected, got nil) (workdir '/var/lib/knot-resolver')

You don't define the `internalDomain` variable.  That's correct in lua and evaluates as nil.

(and as I already posted, please use the correct mailing-list next time)

--Vladimir