I am working on my first Perl module and I have quite a bit of questions about the process. I have read the tutorials and other nodes about it here on Perl Monks, as well as others from a Google search. The error that I get is:

core.pm did not return a true value

Here is my current working code, and before someone says anything about the lack of POD this module will never make it into CPAN it is a module for a personal project.

# Copyright 2009-2010 Adam Jimerson.  All rights reserved
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE.txt file
package core;
use warnings;
use strict;
use Carp;
use Readonly;
use English qw( -no_match_vars );
use DBI;
require Exporter;

our @ISA    = qw(Exporter);
our @EXPORT = ();
our @EXPORT_OK = qw();
my $dbh = q[];

=head1 NAME

core - The great new core!

=head1 VERSION

Version 0.01

=cut

use version 0.77; our $VERSION = qv("v0.01");

BEGIN {

#Added for Windows compatability, some ports of Perl (Active Perl, Str
+awberry Perl, etc) on Windows
#act differently when it comes to using Enviremental data "$ENV{}"
 if ( $^O =~ /MSWin32/ ) {
  if ( !$ENV{HOME} ) {
   if ( $ENV{USERPROFILE} ) {
    $ENV{HOME} = $ENV{USERPROFILE};
   } elsif ( $ENV{HOMEDRIVE} and $ENV{HOMEPATH} ) {
    $ENV{HOME} = $ENV{HOMEDRIVE} . $ENV{HOMEPATH};
   } else {
    croak "Can't set $ENV data, maybe check your install?\n";
   }
  }
 }
}

#Open the Log file
my ($date) = get_time('date');
my $logfile = q[];
if ( $^O =~ /MSWin32/ ) {
 $logfile = $ENV{HOME} . '\TickIt\Logs\\' . "$date.txt";
} else {
 $logfile = "$ENV{HOME}/TickIt/Logs/$date.txt";
}
open my $LOG, '>>',
  $logfile || croak "Error: Can not open \'$logfile\': $OS_ERROR\n";
my ($time) = get_time('time');
print $LOG "[$time] INFO: Using Core $VERSION\n";

sub db_connect {

# Check the status of the database connection, if none exists then cre
+ate a new connection
 Readonly my $DATABASE => q[Repairs];    #Specify the database to be u
+sed
 Readonly my $HOSTNAME => q[localhost];
 Readonly my $PORT     => q[5432];           #PostgreSQL port
 Readonly my $USER     => q[user];    #PostgreSQL username
 Readonly my $PASSWORD => q[password];     #PostgreSQL password
 my $db_connected = q[0];
 my $dsn          = q[];
 if ( $db_connected == 1 ) {
  return;
 } else {
  $dsn = "DBI:Pg:dbname=$DATABASE;host=$HOSTNAME;port=$PORT";
  my $dbh = DBI->connect( $dsn, $USER, $PASSWORD,
                          { AutoCommit => 1, RaiseError => 0 } );
  if ($DBI::errstr) {
   my ($time) = get_time('time');
   print $LOG "[$time] Couldn't authenticate to the Database: $DBI::er
+rstr\n";
   croak "Couldn't authenticate to the Database: $DBI::errstr\n";
  }
  $db_connected++;
 }
 return;
}

sub clear_screen {

 # Clears the screen for both Windows and *nix systems and returns to 
+the caller
 if ( $^O =~ /MSWin32/ ) {
  system 'cls';
 } else {
  system 'clear';
 }
 return;
}

sub display_menu_error {

# if any error messages are passed display them to the user and return
+ to the main menu
 my $msg = shift;
 my ($time) = get_time('time');
 print $LOG "[$time] ERROR: $msg\n";
 clear_screen();
 print "$msg\n\n";
 return;
}

sub process_input {

# takes in information and loops through testing the input for valid a
+lphanumeric characters
 my @data = @_;
 for (@data) {
  chomp;
  s/^\s*//;
  s/\s*$//;
 }
 return @data;
}


sub tech_login {

 #Start tech login section
 #Use the Student ID #
 print 'Please scan barcode to login: ';
 my $techID = <>;
 ($techID) = process_input($techID);
 my $sth = $dbh->prepare('SELECT * FROM tech WHERE id = ?');
 $sth->execute($techID);
 my $tech_details = $sth->fetchrow_hashref();
 if ( $tech_details eq q[] ) {
  display_menu_error("ERROR: Ether invalid ID or no tech found in the 
+system!");
 }
 print "Welcome $tech_details->{firstname} $tech_details->{lastname}\n
+";
 print "ID: $tech_details->{id}\n";
 if ( $techID eq '99' ) {
  print "\nWarning: You are loged in under \"Oh Shit\" mode!\n";
 }
 print "Press Enter To Continue\n";
 <>;

 #End tech login section
 return $techID;
}

sub get_barcode {

 # Gets the barcode information and returns to the calling function
 clear_screen();
 print 'Please Scan System Barcode: ';    # Get barcode information
 my $barcode = <>;
 ($barcode) = process_input($barcode);
 return $barcode;
}


sub get_time {

 # Gets the time from the OS and returns it to the caller
 my $value = shift;
 my ( $sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst ) =
   localtime time;
 $year += 1900;
 my @month_abbr = qw( Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 
+);
 if ( $value eq 'date' ) {
  my $date = "$month_abbr[$mon]-$mday-$year";
  return $date;
 } elsif ( $value eq 'time' ) {
  my $time = "$hour:$min:$sec";
  return $time;
 } else {
  croak "ERROR: No value sent for time retreval!\n";
 }
}

=head1 AUTHOR

Adam Jimerson, C<< <vendion at vendion.net> >>

=head1 BUGS

Bugs?!?!  There are no bugs in this software, but if you think you fou
+nd one anyways send me an email with details on how to reproduce the 
+"bug" along with the correct log file.

1; # End of core
[download]

Can someone here help point out what I am doing wrong?