lib/knot-resolver/sandbox.lua:399: can't open cache path '.';
with version 5.0.1 on FreeBSD 12.1 I get the following when starting kresd
kresd -n -c /usr/local/etc/knot-resolver/kresd.conf /var/db/kresd
[system] error while loading config: /usr/local/lib/knot-resolver/sandbox.lua:399: can't open cache path '.'; working directory '/var/db/kresd'; Invalid argument (workdir '/var/db/kresd')
the LMDB files are created as specified with cache.size
but then kresd gives up with the above error.