[CentOS 5.6]Failed to open port 10000

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http://linuxfloat.org – I am seting up a Centos 5.6 sever. I yum installed webmin successfully,and then I followed webmin's document to add "-A INPUT -p tcp -m tcp --dport 10000 -j ACCEPT"  to /etc/sysconfig/iptables ,but when I /etc/init.d/iptables restart. I get   Applying iptables firewall rules: iptables-restore: line 1 failed Any idea? (HowTos)