Fatal error: Uncaught Error: Interface "PHPExcel_IComparable" not found in C:\melius\michael.douglas\web\prod\credpay\_common\classes\PHPExcel\Style\Conditional.php:36 Stack trace: #0 {main} thrown in C:\melius\michael.douglas\web\prod\credpay\_common\classes\PHPExcel\Style\Conditional.php on line 36