Fatal error: Uncaught Error: Interface "PhpOffice\PhpSpreadsheet\IComparable" not found in D:\xampp\htdocs\vendor\phpoffice\phpspreadsheet\Style\Conditional.php:9 Stack trace: #0 {main} thrown in D:\xampp\htdocs\vendor\phpoffice\phpspreadsheet\Style\Conditional.php on line 9