Hello about 2 days ago our ping script started generating errors during the running of the script Error shown:

Checking "devicename"... alive Use of uninitialized value in split at 
+script/ping2.pl line 74, <IN> line 17
Use of uninitialized value $NBTHost in string eq at script.ping2.pl li
+ne 76 <IN> . line 17
Not unique
Use of uninitialized value $NBTHost in concatenation <.> or string at 
+script/ping2.pl line 97, <IN> line 17.
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I am a novice when it comes to this so any help would be appriciated This is the full script

#!/usr/bin/env perl
use warnings;
use strict;
#
# Author: 
#
# 2011(C)
#
# Change History
# 0.1                    Initial Release
# 0.2 20150109.01                Added epoport.txt file to pass ePO po
+rt
#
# Description: Reads list of server names by their host names, checks 
+to see if
# they are alive via ping, completes an nbtstat -a and returns any lin
+es containing
# the host name and then checks to see if ePO port is open on the aliv
+e system.
#
# Input:
#    srvlst.txt containing one hostname per line
#    epoport.txt containing ePO port
#
# Output:
#    PingResults.csv
#        Format: Hostname, IP address, Alive status (Yes|No|Unknown Ho
+st|Unreachable|Unknown status), NBTSTAT result (NUL|$hostname), ePO p
+ort status (Open|closed)

my $epoport = '';
my $socket = "";
my $hostcnt = 0;

open (my $conf, '<epoport.txt') or die "Run aborted. Cannot open the e
+PO port file (epoport.txt)";
while(<$conf>) { 
   my $line = $_;
   chomp($line);
   ($epoport) = split(",", $line);
};
close ($conf);
print "ePO port: $epoport\n\n";

open (IN, "<srvlst.txt") or die "Run aborted. Cannot open endpoint lis
+t file (srvlst.txt)";
open (OUT, ">PingResults.csv") or die "Run aborted. Unable to open res
+ult file (PingResults.csv)";
print OUT "Hostname,IP,Alive,NBTHost,Port $epoport\n";

print "Start to check hosts\n";

while (<IN>) { 
    my $HOST = $_;
    chomp $HOST;
    print "Checking $HOST... ";
    my $IP = '';
    my $NBTHost = '';
    my $Alive = 'No';
    my $ePOPort = 'Closed';
    my $out = "";

    ++$hostcnt;

    my $PingReply = `PING -n 1 -w 1 $HOST`;
    if ($PingReply =~ /unreachable/) {
        print "unreachable\n";
        $Alive = 'Unreachable';
    } elsif ($PingReply =~ /Reply from/) {
        $Alive = 'Yes';
        print "alive ";
        my @Temp = split / /, $PingReply;
        $IP = $Temp[2];
        $IP =~ s/\[//g;
        $IP =~ s/\]//g;
        my $NBTResults = `nbtstat -a $IP | find \"UNIQUE\"`;
        while (index($NBTResults,'  ') > -1) {
            $NBTResults =~ s/  / /g;
        }
        my @NBTResults = split /\n/, $NBTResults;
    
        # We only need the first returned hostname of the NBT results 
+(they're usually duplicates)
        my @LineTemp = split / /, $NBTResults[0];
        $NBTHost = $LineTemp[1];
        if ($NBTHost eq $HOST) {
            $NBTHost = '';
            print "unique\n";
            # Check ePO open port
            my $epoResponse = CheckPort($HOST,$epoport);
            if ($epoResponse == 1) {
                $ePOPort = "Open";
            } else {
                $ePOPort = "Closed";
            };
         } else {
            print "Not unique\n";
            $Alive = 'Unknown status';
        }
    } elsif ($PingReply =~ /could not find host/) {
        print "unknown\n";
        $Alive = 'Unknown host';
    } else {
        print "not alive\n";
        $Alive = 'No';
    }
    print OUT "$HOST,$IP,$Alive,$NBTHost,$ePOPort\n";
}
close OUT;
close IN;
print "\nCheck completed. Checked $hostcnt hosts\n";

sub CheckPort {
    use IO::Socket::INET;
    my ($host,$port) = @_;
    my $open = eval{ $socket = new IO::Socket::INET # opens a socket
    (
    PeerAddr => $host,
    PeerPort => $port,
    Proto => getprotobyname('tcp') || 6 # tcp socket or sopcket 6(for 
+old comps)
    )};

    if ($open) { return 1; }
    else { return 0; }
}
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thank you