Problem with External Script, Zabbix1.4

[Umair]

Hello, I have an external script named "rnc".
It is a simple script that executes Telent Session on a remote host and gathers back the results from the host for some operations.
Based on the processing, the script prints either 0 or 1. (required for the zabbix external scripts)
When executed normally, that is through the command promt, it works fine.
But when i integrate it with Zabbix as an external script, it gives me the following error :

3870:20070619:123604 Expression [{11953}<1] cannot be evaluated [Unable to get value for functionid [11953]]

The Expression for the Item is :

rnc(1)

The expression for the trigger is :

{Assoc:rnc(1).max(2)}<1

Where :

Assoc: Name of Host
rnc : Name of External Script
Max : Function

Any clues, as why the script works outside perfectly but fails to work altogether when used with Zabbix ?

The script is :

$ip_address = $ARGV[1];
$port = $ARGV[2];

$t = Net::Telnet->new(Host => $ip_address,Port=>$port);

@recent = $t -> cmd ("assoc list");
@recent = $t -> cmd ("assoc list");
open (MYFILE, '>/etc/zabbix/externalscripts/'.$ip_address);
print MYFILE "@recent";
close (MYFILE);
open (MYFILE, '/etc/zabbix/externalscripts/'.$ip_address);
@raw_data=<MYFILE>;

@prot_data=("DK","UDP","TCP");

OUTER: foreach $val (@raw_data)
{
chop($val);

if(($index_val = index($val, "DK"))!=-1 || ($index_val = index($val, "UDP"))!=-1 || ($index_val = index($val, "TCP"))!=-1 ){

$new_string =substr($val, $index_val);

($prot,$w_active,$w_up)=split(' ',$new_string);

if($w_active eq "No" || $w_up eq "No") {
print "0";
last OUTER;
}

}


}