Perl is returning this error when I try to run this code:

Not a HASH reference at /usr/share/perl5/Spreadsheet/WriteExcel/Worksh
+eet.pm line 1798.
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And I'm at a loss for where it might be. Also, as I've been faced with this before, what is the best way to track down issues when the error comes from the module itself? I looked at the code there (for the heck of it) - I'm about 99.9% sure I messed up somewhere. My 'messed up' code is below.

#!/usr/bin/perl -T

use strict;
use warnings;
use Carp::Assert;

use Spreadsheet::ParseExcel;
use Spreadsheet::WriteExcel;

use lib '/home/shawn/test/ais';
use DBConnect;

my( $infile ) = $ARGV[ 0 ] =~ m/^([\ A-Z0-9_.-]+)$/ig;
my( $date ) = $ARGV[ 1 ] =~ m/^([0-9-]+)$/ig;


print "infile = $infile\n";


my $sth = $dbh->prepare( 'SELECT * 
      FROM table 
      WHERE field = ? 
      AND YEAR(time) = ?'
   ) or die "QUERY FAIL: $DBI::errstr\n$!\n";

my @header = ([ "Some", "header", "fields" ]);

my $parser   = Spreadsheet::ParseExcel->new();
my $workbookin = $parser->parse( $infile );

if ( !defined $workbookin ) {
   die "Can\'t read spreadsheet: ", $parser->error(), ".\n";
}

for( my $sheetcount = 0; $sheetcount < $workbookin->{SheetCount}; $she
+etcount++ ) {

   my($name, $indata, $width) = readws( $sheetcount );

   my $outfile = $name =~ /^([\ A-Z0-9_-]+)$/;

   my $workbookout = Spreadsheet::WriteExcel->new( $outfile . ".xls" )
+;
   my $worksheetout = $workbookout->add_worksheet( 'Data' );
   $worksheetout->write_col( 0, 0, @$indata );

   foreach my $row ( 1 .. @$indata) {

      my $sqldata = sqlget( $indata->[ $row ]->[ 3 ] );
      if( $sqldata->[ 0 ] ) {

         my $worksheetout = $workbookout->add_worksheet( $indata->[ $r
+ow ]->[ 0 ] );
         foreach my $col ( @$width ) {

            $worksheetout->set_column( $col, $col, $width->[ $col ] );
         }
         $worksheetout->write_col( 0, 0, \@header );
         $worksheetout->write_col( 1, 0, @$sqldata );
      }
   }
}



sub readws {                     # Read worksheet - return worksheet n
+ame, data, and max cell width

   my $wsnum = $_[ 0 ];          # Count of input worksheet

   my $worksheetin = $workbookin->{Worksheet}[ $wsnum ];

   my( @xldata, @width );

   my( $row_min, $row_max ) = $worksheetin->row_range();
   my( $col_min, $col_max ) = $worksheetin->col_range();
   my $wsname = $worksheetin->{Name};  # Name of worksheet

   for my $row ( $row_min .. $row_max ) {
      for my $col ( $col_min .. $col_max ) {

         $width[ $col ] = 0 unless $width[ $col ];

         my $cell = $worksheetin->get_cell( $row, $col );
         next unless $cell;

         $xldata[ $row ][ $col ] = $cell->unformatted() ;
         if( length( $xldata[ $row ][ $col ] ) > $width[ $col ] ) {
            $width[ $col ] = length( $xldata[ $row ][ $col ] );
         }
      }
   }
   return( $wsname, \@xldata, \@width );
}


sub sqlget {                     # Return sql data

   my $sqlin = $_[ 0 ];

   $sth->execute( $sqlin, $date );

   my $sqlout = $sth->selectall_arrayref;

   if( $sth->rows > 0) {
      return $sqlout;
   } else {
      return undef;
   }
}
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