PHPExcel class not fount in Codeigniter 3.0.3

I have update my codeigniter to 3.0.3 version and while using PHPExcel i get this error

Fatal error: Class 'PHPExcel_Worksheet_PageSetup' not found in /opt/lampp/htdocs/c3/application/third_party/PHPExcel/Worksheet.php on line 353

I can't think of any particular reason this would be related to CI 3.0.3. I use PHPExcel to a very limited extent and haven't seen any issues, but you may be doing something I'm not. I would recommend checking the PHPExcel installation and whatever autoloader you're using for it.

Bonfire

Practical CodeIgniter 3
CodeIgniter Testing Guide