Fatal error: Uncaught Error: Class "PHPExcel_Writer_OpenDocument_WriterPart" not found in E:\www\frey\qgmvc\v1.0\composer\vendor\phpoffice\phpexcel\Classes\PHPExcel\Writer\OpenDocument\Thumbnails.php:28 Stack trace: #0 {main} thrown in E:\www\frey\qgmvc\v1.0\composer\vendor\phpoffice\phpexcel\Classes\PHPExcel\Writer\OpenDocument\Thumbnails.php on line 28