I run the script and it returns: Can't call method getAttribute on an undefined value at line 114

Here is a link to the discussion on codingforums, not sure if it will help.

http://www.codingforums.com/showthread.php?t=171916

They mentioned that possible one of the modules wasnt working correctly. I am not a programmer and I am in need of help.

Thanks to all that contribute.

Here is the complete code:

#!/usr/bin/perl

#################################################################
# Yahoo Weather Rss Information Atomizer
# Version 0.7.1
# Loud-Soft.com
# Provided As Is
#################################################################

use strict;
use XML::XPath;
use LWP::Simple;
use XML::XPath::XMLParser;
use Getopt::Long;
use File::Copy;

#################################################################
# Variables
#################################################################
# Constants (Change these to localize)
my $zipcode = "60642";
my $unit = "F";
my $scripthome = "/Library/prlprograms/yweather.pl";
my $icondir = $scripthome."images/";
my $datadir = $scripthome."data/";
my $datafile = $datadir."weather.xml";
my $imagefile = $icondir."weather.png";

# Constants (Do not change these)
my $pre="yweather";
my $uri="http://xml.weather.yahoo.com/ns/rss/1.0";
my $url="http://xml.weather.yahoo.com/forecastrss?p=$zipcode&u=$unit";
my %data;
my $xp;

#################################################################
# Subroutines
#################################################################
# Print usage
sub usage {
print "Yahoo Weather Information\n\n";
print "Usage:\n";
print " ./yweather.pl -ct Displays current temperature\n\n";
print "Arguments: \n";
print " -lc City \n";
print " -lr Region\n";
print " -lt Country\n";
print " -cc Weather Code (used for images)\n";
print " -ct Current Temperature\n";
print " -cw Current Weather Description\n";
print " -cd Current Date\n";
print " -ah Current Humidity\n";
print " -av Current Visibilty\n";
print " -ap Current Barometric Pressure\n";
print " -ar Change in Barometric Pressure\n";
print " -sr Time of Sunrise\n";
print " -ss Time of Sunset\n";
print " -wc Current Wind Chill\n";
print " -wd Current Wind Direction\n";
print " -ws Current Wind Speed\n";
print " -ut Temperature Unit\n";
print " -ud Distance Unit\n";
print " -up Pressure Unit \n";
print " -us Speed Unit\n";
print " -fd1 Tomorrow's Day\n";
print " -fg1 Tomorrow's Date\n";
print " -fl1 Tomorrow's Low Temp\n";
print " -fh1 Tomorrow's High Temp\n";
print " -ft1 Tomorrow's Description\n";
print " -fc1 Tomorrow's Weather Code\n";
print " -fd2 Day After Tomorrow's Day\n";
print " -fg2 Day After Tomorrow's Date\n";
print " -fl2 Day After Tomorrow's Low Temp\n";
print " -fh2 Day After Tomorrow's High Temp\n";
print " -ft2 Day After Tomorrow's Description\n";
print " -fc2 Day After Tomorrow's Weather Code\n";
print " --copyimage Copy Appropriate Image to Current Image\n";
print " --update Update xml source file\n" ;
print " \n";
print "All data is returned without units. To get data with units,\n";
print "use a combination of commands.\n\n";
print "Example: (Displays Current temperature with unit)\n";
print " ./yweather.pl -ct && ./yweather.pl -ut\n";
}

# Print data
sub args{
my ($arg) = @_;
print $data{$arg} . "\n";
}

# Subroutine to update xml data from yahoo
sub update_weather {
LWP::Simple::getstore($url,$datafile);
}

# Subroutine to download images from yahoo
sub get_images {
my $imgurl = "http://l.yimg.com/a/i/us/nws/weather/gr/";
for (0..47) {
LWP::Simple::getstore($imgurl.$_."d.png",$icondir.$_."d.png");
LWP::Simple::getstore($imgurl.$_."n.png",$icondir.$_."n.png");
}
File::Copy::copy($icondir."0d.png", $imagefile);
}

# Parse XML
sub get_data {
my($element, $attribute, $index) = @_;
if ($index){$index=1;}

my $nodeset = $xp->find("//yweather:$element");
my $node = $nodeset->get_node($index);
return $node->getAttribute($attribute);
}

# Copy correct image to the image define in $imagefile
sub copy_image {
my ($second, $minute, $hour, $dayOfMonth, $month,
$yearOffset, $dayOfWeek, $dayOfYear, $daylightSavings) = localtime();
my $night = $data{'ss'};
my $morning = $data{'sr'};
# my $condition = $data{'cc'};
my $imagesub;
if ($hour % 12){
if(($hour-12) < int(substr($night,0,1))){
$imagesub = "d";
}elsif(($minute) < int(substr($night,2,3))){
$imagesub = "d";
}else{
$imagesub = "n";
}
} else {
if(($hour) < int(substr($morning,0,1))){
$imagesub = "n";
}elsif(($minute) < int(substr($morning,2,3))){
$imagesub = "n";
}else{
$imagesub = "d";
}
}
File::Copy::copy($icondir.$data{'cc'}.$imagesub.".png", $imagefile)
or die "File ".$icondir.$data{'cc'}.$imagesub.".png"." cannot be copie
+d. ".$data{'lr'};
}

#################################################################
# Check that files exist
#################################################################
#ensure directories exist
unless(-d $datadir){
mkdir $datadir;
}
unless(-d $icondir){
mkdir $icondir;
}

# Check if weather.xml exists
if (!(-e $datafile)){update_weather()}
$xp = XML::XPath->new(filename => $datafile);
$xp->set_namespace($pre, $uri);

# Check if images exist
if (!(-e $icondir."0d.png")){get_images()}

# Check if image exist
if (!(-e $imagefile)){copy_image()}


#################################################################
# Data Setup
#################################################################
# Location Information
$data{'lc'} = get_data("location","city");
$data{'lr'} = get_data("location","region");
$data{'lt'} = get_data("location","country");

# Current Weather Information
$data{'cc'} = get_data("condition","code");
$data{'ct'} = get_data("condition","temp");
$data{'cw'} = get_data("condition","text");
$data{'cd'} = get_data("condition","date");

# Current Atmosphere Information
$data{'ah'} = get_data("atmosphere","humidity");
$data{'av'} = get_data("atmosphere","visibility");
$data{'ap'} = get_data("atmosphere","pressure");
$data{'ar'} = get_data("atmosphere","rising");

# Todays Sunrise and sunset
$data{'sr'} = get_data("astronomy","sunrise");
$data{'ss'} = get_data("astronomy","sunset");

# Current wind information
$data{'wc'} = get_data("wind","chill");
$data{'wd'} = get_data("wind","direction");
$data{'ws'} = get_data("wind","speed");

# Unit information
$data{'ut'} = get_data("units","temperature");
$data{'ud'} = get_data("units","distance");
$data{'up'} = get_data("units","pressure");
$data{'us'} = get_data("units","speed");

# Forecast (Tomorrow)
$data{'fd1'} = get_data("forecast[1]","day");
$data{'fg1'} = get_data("forecast[1]","date");
$data{'fl1'} = get_data("forecast[1]","low");
$data{'fh1'} = get_data("forecast[1]","high");
$data{'ft1'} = get_data("forecast[1]","text");
$data{'fc1'} = get_data("forecast[1]","code");

# Forecast (Day after tomorrow)
$data{'fd2'} = get_data("forecast[2]","day");
$data{'fg2'} = get_data("forecast[2]","date");
$data{'fl2'} = get_data("forecast[2]","low");
$data{'fh2'} = get_data("forecast[2]","high");
$data{'ft2'} = get_data("forecast[2]","text");
$data{'fc2'} = get_data("forecast[2]","code");

#################################################################
# Parse arguments
#################################################################
if(($#ARGV + 1) == 1){
my $arg = substr($ARGV[0],1);
if ($data{$arg}){
args($arg);
} elsif($arg eq "-update"){
update_weather();
} elsif($arg eq "-copyimage"){
copy_image();
} else {
usage();
}
} else {
usage();
}
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