Fatal error: Uncaught Error: Interface "PHPExcel_IComparable" not found in E:\www\ypmvc\3.0\mvc\composer\vendor\phpoffice\phpexcel\Classes\PHPExcel\Style\Conditional.php:36 Stack trace: #0 {main} thrown in E:\www\ypmvc\3.0\mvc\composer\vendor\phpoffice\phpexcel\Classes\PHPExcel\Style\Conditional.php on line 36