Fatal error: Uncaught Error: Class "PHPExcel_Writer_Abstract" not found in /home/edepracl/public_html/moodle30/lib/phpexcel/PHPExcel/Writer/Excel2007.php:28 Stack trace: #0 {main} thrown in /home/edepracl/public_html/moodle30/lib/phpexcel/PHPExcel/Writer/Excel2007.php on line 28