Iptables - Error: No chain/target/match by that name

["Rafael Dewes" <rafael.dws@gmail.com>]

Friends, I am using iptables 1.5.7 + linux kernel 2.6.20.2 and the
last patch-o-magic.

But, when I exec this rule
iptables -I INPUT -s 192.168.0.0/24 -p tcp --dport 21 -j ACCEPT
This error occurs
iptables: No chain/target/match by that name

This occurs in the chain ACCEPT, DROP and REJECT, but if I modify the
rule for the following one:
iptables -I INPUT -s 192.168.0.0/24 -p tcp -j ACCEPT
or
iptables -I INPUT -s 192.168.0.0/24 -j ACCEPT

it is accepted, the error only occurs when I specify the the origin or
destination port.

Any Ideas to solve this?
Thanx.

iptables -L output:
Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

modules loaded:
/sbin/modprobe ipt_REDIRECT
/sbin/modprobe ipt_state
/sbin/modprobe ipt_recent
/sbin/modprobe ipt_MASQUERADE
/sbin/modprobe ipt_LOG
/sbin/modprobe ip_tables
/sbin/modprobe iptable_filter
/sbin/modprobe iptable_nat
/sbin/modprobe ipt_conntrack
/sbin/modprobe ip_conntrack