Fatal error: Uncaught Error: Interface "PhpOffice\PhpSpreadsheet\RichText\ITextElement" not found in /var/www/html/upload/PhpSpreadsheet-master/src/PhpSpreadsheet/RichText/TextElement.php:7 Stack trace: #0 {main} thrown in /var/www/html/upload/PhpSpreadsheet-master/src/PhpSpreadsheet/RichText/TextElement.php on line 7