Fatal error: Uncaught Error: Class 'PHPExcel_CachedObjectStorage_CacheBase' not found in C:\Apache24\htdocs\PortalUIS_bkp\excel\Spreadsheet\Excel\Classes\PHPExcel\CachedObjectStorage\Memory.php:36 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\PortalUIS_bkp\excel\Spreadsheet\Excel\Classes\PHPExcel\CachedObjectStorage\Memory.php on line 36