I chose not to reconfigure the services during the upgrade since I have extensively edited my postfix and apache config files. could this be the reason why every time I restart apache2 I get this error: until I manually delete that line from the vhost file. If I need to update the services to get this working again, how can I do that?
Edit the vhost master template in /usr/local/ispconfig/server/conf and comment out the line in that file.