I saw that from version 10.0 forward you supported PivotTables in BigSpreadSheets and I try to use it for one of the reports and it throws an error:
it worked when using koolreport\excel\ExcelExportable; All i did is change
use koolreport\excel\ExcelExportable;
to
use koolreport\excel\BigSpreadsheetExportable;
and when exporting it I call
$this->exportToXLSX('ExampleReportExcel')->saveAs($path);