# ./sbin/slapadd -F etc/'cn=config' -l etc/openldap/slapd.ldif

57680d0f invalid config directory etc/cn=config, error 2

slapadd: bad configuration directory!

# mkdir -p 'etc/cn=config'

I've ensured the appropriate var/openldap-data directory exists. I've tried adding the maxsize key shown on the guide. I am not sure what else could cause this, as this is for the hardcoded cn=config database.