Notice: Use of undefined constant PHPEXCEL_ROOT - assumed 'PHPEXCEL_ROOT' in /var/www/html/pota/includes/Classes/PHPExcel/Autoloader.php on line 71

Fatal error: Uncaught Error: Class 'PHPExcel_Shared_ZipStreamWrapper' not found in /var/www/html/pota/includes/Classes/PHPExcel/Autoloader.php:29 Stack trace: #0 {main} thrown in /var/www/html/pota/includes/Classes/PHPExcel/Autoloader.php on line 29