Fatal error: Uncaught Error: Interface "PhpOffice\PhpSpreadsheet\IComparable" not found in /var/www/html/upload/PhpSpreadsheet-master/src/PhpSpreadsheet/RichText/RichText.php:10 Stack trace: #0 {main} thrown in /var/www/html/upload/PhpSpreadsheet-master/src/PhpSpreadsheet/RichText/RichText.php on line 10