I tried to run following code from http://search.cpan.org/dist/Spreadsheet-WriteExcel/lib/Spreadsheet/WriteExcel/Chart/Pie.pm page, got error message "Can't locate object method "add_chart" via package "Spreadsheet::WriteExcel" ". I checked that "add_chart" exists in Workbook.pm

 
    use strict;
    use Spreadsheet::WriteExcel;

    my $workbook  = Spreadsheet::WriteExcel->new( 'chart_pie.xls' );
    my $worksheet = $workbook->add_worksheet();
    my $bold      = $workbook->add_format( bold => 1 );

    # Add the worksheet data that the charts will refer to.
    my $headings = [ 'Category', 'Values' ];
    my $data = [
        [ 'Apple', 'Cherry', 'Pecan' ],
        [ 60,       30,       10     ],
    ];

    $worksheet->write( 'A1', $headings, $bold );
    $worksheet->write( 'A2', $data );

    # Create a new chart object. In this case an embedded chart.
    my $chart = $workbook->add_chart( type => 'pie', embedded => 1 );

    # Configure the series.
    $chart->add_series(
        name       => 'Pie sales data',
        categories => '=Sheet1!$A$2:$A$4',
        values     => '=Sheet1!$B$2:$B$4',
    );
    # Add a title.
    $chart->set_title( name => 'Popular Pie Types' );


    # Insert the chart into the worksheet (with an offset).
    $worksheet->insert_chart( 'C2', $chart, 25, 10 );

#print "chart:@chart\";
    __END__
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