Fatal error: Uncaught Error: Class 'PHPPowerPoint_Writer_PowerPoint2007_Slide' not found in /var/www/html/Classes/PHPPowerPoint/Writer/PowerPoint2007/Chart.php:36 Stack trace: #0 {main} thrown in /var/www/html/Classes/PHPPowerPoint/Writer/PowerPoint2007/Chart.php on line 36