19:17:05 Create new PHPExcel object
19:17:05 Set document properties
19:17:05 Add some data
19:17:05 Add conditional formatting
19:17:05 Duplicate the conditional formatting across a range of cells
19:17:05 Write to Excel2007 format

Fatal error: Uncaught exception 'PHPExcel_Writer_Exception' with message 'Could not close zip file /var/www/backup/20160830/vendor/phpoffice/phpexcel/Examples/08conditionalformatting2.xlsx.' in /var/www/backup/20160830/vendor/phpoffice/phpexcel/Classes/PHPExcel/Writer/Excel2007.php:399 Stack trace: #0 /var/www/backup/20160830/vendor/phpoffice/phpexcel/Examples/08conditionalformatting2.php(110): PHPExcel_Writer_Excel2007->save('/var/www/backup...') #1 {main} thrown in /var/www/backup/20160830/vendor/phpoffice/phpexcel/Classes/PHPExcel/Writer/Excel2007.php on line 399