How to block all outbound traffic except Tor

I have tried to use these rules with iptables but after I have used same rules in ip6tables, it has blocked everything. Why do my ip6tables rules block everything?

iptables -F OUTPUT
iptables -A OUTPUT -j ACCEPT -m owner --uid-owner debian-tor
iptables -A OUTPUT -j ACCEPT -o lo
iptables -P OUTPUT DROP


ip6tables -F OUTPUT
ip6tables -A OUTPUT -j ACCEPT -m owner --uid-owner debian-tor
ip6tables -A OUTPUT -j ACCEPT -o lo
ip6tables -P OUTPUT DROP