Fatal error: Uncaught Error: Interface "PhpOffice\PhpSpreadsheet\IComparable" not found in C:\melius\michael.douglas\web\prod\credpay\_common\classes\phpspreadsheet\richtext\richtext.php:9 Stack trace: #0 {main} thrown in C:\melius\michael.douglas\web\prod\credpay\_common\classes\phpspreadsheet\richtext\richtext.php on line 9