Error when using iptables 1.2.6a (or another version)

["Philippe Dhont (Sea-ro)" <Philippe.Dhont@searo.be>]

[root@server11 iptables-1.2.6]# ./iptables -L
/lib/modules/2.4.18-6mdksecure/kernel/net/ipv4/netfilter/ip_tables.o.gz:
init_module: Device or resource busy
Hint: insmod errors can be caused by incorrect module parameters, including
invalid IO or IRQ parameters
modprobe: insmod
/lib/modules/2.4.18-6mdksecure/kernel/net/ipv4/netfilter/ip_tables.o.gz
failed
modprobe: insmod ip_tables failed
iptables v1.2.6: can't initialize iptables table `filter': iptables who? (do
you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
[root@server11 iptables-1.2.6]# 


This is what i get, i'm pretty new with iptables but i really would like to
use it.

Greetz!

Philippe Dhont