Fatal error: Uncaught Error: Class 'PHPExcel_Settings' not found in E:\code\yqhswz\core\ThinkPHP\Library\Vendor\PHPExcel\Writer\PDF\mPDF.php:30 Stack trace: #0 {main} thrown in E:\code\yqhswz\core\ThinkPHP\Library\Vendor\PHPExcel\Writer\PDF\mPDF.php on line 30