Fatal error: Uncaught Error: Interface "PhpOffice\PhpSpreadsheet\IComparable" not found in C:\xampp\htdocs\xlsss\PhpSpreadsheet-master\src\PhpSpreadsheet\RichText\RichText.php:9 Stack trace: #0 {main} thrown in C:\xampp\htdocs\xlsss\PhpSpreadsheet-master\src\PhpSpreadsheet\RichText\RichText.php on line 9