Fatal error: Uncaught Error: Class 'PHPExcel_CachedObjectStorage_CacheBase' not found in C:\Apache241\htdocs\phpexcel\Classes\PHPExcel\CachedObjectStorage\MemorySerialized.php:36 Stack trace: #0 {main} thrown in C:\Apache241\htdocs\phpexcel\Classes\PHPExcel\CachedObjectStorage\MemorySerialized.php on line 36