Fatal error: Uncaught Error: Interface "PHPExcel_IComparable" not found in C:\web\xampp02\htdocs\EasyTec\excel01\Classes\PHPExcel\Worksheet\Drawing\Shadow.php:28 Stack trace: #0 {main} thrown in C:\web\xampp02\htdocs\EasyTec\excel01\Classes\PHPExcel\Worksheet\Drawing\Shadow.php on line 28