What potential errors or mistakes should users look out for when using PHPExcel-Writer to create Excel files with charts?

When using PHPExcel-Writer to create Excel files with charts, users should be cautious of potential errors related to chart data ranges. Make sure to correctly specify the range of data to be included in the chart to avoid any data discrepancies or missing values in the chart.

// Specify the correct range of data for the chart
$sheet->fromArray($data, NULL, 'A1');
$chart = new PHPExcel_Chart(
    'chart1', // name
    NULL, // title
    NULL, // legend
    $dataSeries, // data series
    true, // plot visible cells only
    'line', // chart type
    NULL, // plot group
    'A2:A6', // data labels
    NULL // layout
);