iptables error Couldn't load match `state':/var/iptables/libipt_state.so

Lock decoder, do not have access to activate the firewall.

PLi dm500 OpenPLi 20130505 (based on 1.09)
welcome on your dreambox! - Kernel 2.6.9 (18:43:59).
dm500 login: root
Password:


BusyBox v1.01 (2011.08.17-20:40+0000) Built-in shell (ash)
Enter 'help' for a list of built-in commands.

root@dm500 ~ # iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables v1.3.5: Couldn't load match `state':/var/iptables/libipt_state.so: cann
ot open shared object file: No such file or directory

Try `iptables -h' or 'iptables --help' for more information.
root@dm500 ~ #