We have getting these warning in PHPExcel in Magento. Checked path, permissions and others things seems all good.
Seems some autoloader issue is there. 2016-09-30T20:55:24+00:00 ERR (3): 192.168.56.1 - Warning: include(PHPExcel/Shared/ZipStreamWrapper.php): failed to open stream: No such file or directory in /home/public_html/app/code/core/Mage/Core/functions.php on line 68 2016-09-30T20:55:24+00:00 ERR (3): 192.168.56.1 - Warning: include(): Failed opening 'PHPExcel/Shared/ZipStreamWrapper.php' for inclusion (include_path='/home/public_html/app/code/local:/home/public_html/app/code/community:/home/public_html/app/code/core:/home/public_html/lib:.:/usr/share/pear:/usr/share/php') in /home/public_html/app/code/core/Mage/Core/functions.php on line 68
2016-09-30T20:55:24+00:00 ERR (3): 192.168.56.1 - Warning: include(PHPExcel/Shared/String.php): failed to open stream: No such file or directory in /home/public_html/lib/Varien/Autoload.php on line 93 2016-09-30T20:55:24+00:00 ERR (3): 192.168.56.1 - Warning: include(): Failed opening 'PHPExcel/Shared/String.php' for inclusion (include_path='/home/public_html/app/code/local:/home/public_html/app/code/community:/home/public_html/app/code/core:/home/public_html/lib:.:/usr/share/pear:/usr/share/php') in /home/public_html/lib/Varien/Autoload.php on line 93