Fatal error: Uncaught Error: Interface 'PHPExcel_IComparable' not found in D:\Apache241\htdocs\phpexcel\Classes\PHPExcel\Worksheet\Drawing\Shadow.php:36 Stack trace: #0 {main} thrown in D:\Apache241\htdocs\phpexcel\Classes\PHPExcel\Worksheet\Drawing\Shadow.php on line 36