Uncaught exception 'Zend_Log_Exception' with message file.log cannot be opened with mode "a"

Put the right permission on the file: 0777.

Check if the directory /home/http/me.tv/fbapps/www/tmp/logs/ exists, then run this command in a terminal:

chmod 777 /home/http/me.tv/fbapps/www/tmp/logs/vengeance.log

The web server user should have the right to write and exec (to pass through) on the logs folder.

chown www-data:www-data -R logs/ # change www-data by the user of the web server chmod 755 -R logs/

It s a very bad idea to put 777 somewhere.