ownCloud 4 on Fedora 16
As you can see (on opening the screenshot), there is missing header error from ‘/var/www/html/owncloud/apps/files_odfviewer/appinfo/app.php’. This post here told me that it could be due to a empty line. So that;s it. I went to the file and removed the line no. 8 which was an empty line! And it works fine.