Fatal error: Uncaught Error: Interface 'PHPExcel_RichText_ITextElement' not found in C:\xampp\htdocs\BeiDou_website\z\class\Doffice\PHPExcel\RichText\TextElement.php:26 Stack trace: #0 {main} thrown in C:\xampp\htdocs\BeiDou_website\z\class\Doffice\PHPExcel\RichText\TextElement.php on line 26