23:17:17 Create new PHPExcel object
23:17:17 Set document properties
23:17:17 Add some data
23:17:17 Set header/footer
23:17:17 Add a drawing to the header

Fatal error: Uncaught exception 'PHPExcel_Exception' with message 'File ./images/phpexcel_logo.gif not found!' in /var/www/html/back/vendor/phpoffice/phpexcel/Classes/PHPExcel/Worksheet/HeaderFooterDrawing.php:312 Stack trace: #0 /var/www/html/back/vendor/phpoffice/phpexcel/Examples/04printing.php(72): PHPExcel_Worksheet_HeaderFooterDrawing->setPath('./images/phpexc...') #1 {main} thrown in /var/www/html/back/vendor/phpoffice/phpexcel/Classes/PHPExcel/Worksheet/HeaderFooterDrawing.php on line 312