Hey I know this is an old post, but I thought this would help. Odds are you are not only running this on a VPS, but your host is using OpenVZ, which means TUN/TAP is not enabled on the container. I made a quick post about it on my blog. Hope this helps!
http://danblee.com/iptables-service-not-started-because-of-error-svc_run_except/
