I am getting error " iptables: invalid argument " while adding ESTABLISHED RULES in OpenVZ

When you try to add ESTABLISHED rules in iptables on OpenVZ and if you get this message.

iptables: invaild argument.

 then follow these steps.

1) go to main server
2) vi /etc/vz/vz.conf
3) Add these many modules in the file
IPTABLES="ipt_REJECT ipt_tos ipt_limit ipt_multiport iptable_filter iptable_mangle   ipt_ttl ipt_state iptable_nat ip_nat_ftp ip_tables ipt_conntrack ip_conntrack_ftp ipt_LOG
4) Save file and exit
5) Restart VE
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