Fatal error: Uncaught Error: Class 'PHPExcel_Writer_Excel2007_WriterPart' not found in /opt/lampp/htdocs/dhtmlxSuite_v5.1/codebase/grid-excel-php/lib/PHPExcel/Writer/Excel2007/RelsRibbon.php:28
Stack trace:
#0 {main}
thrown in /opt/lampp/htdocs/dhtmlxSuite_v5.1/codebase/grid-excel-php/lib/PHPExcel/Writer/Excel2007/RelsRibbon.php on line 28