Notice: Use of undefined constant PHPEXCEL_ROOT - assumed 'PHPEXCEL_ROOT' in /var/www/html/jiazheng/extend/phpexcel/PHPExcel/Autoloader.php on line 73

Fatal error: Uncaught Error: Class 'PHPExcel_Shared_String' not found in /var/www/html/jiazheng/extend/phpexcel/PHPExcel/Autoloader.php:36 Stack trace: #0 {main} thrown in /var/www/html/jiazheng/extend/phpexcel/PHPExcel/Autoloader.php on line 36