Hi we have installed newscoop-4.4.7 on ubuntu 14.04 LTS amazon ec2 instance , we did follow this guide http://sourcefabric.booktype.pro/newscoop-44-for-journalists-and-editors/manual-installation/ , newscoop installation successfully done but when we are going to publish article then its shows blank page and when i saw apache error log then its show some error regarding pdo and php fatal error,but all php extension are already loaded