NameVirtualHost *:80 has no VirtualHosts error

Bij het herstarten van Apache verschijnt de error: NameVirtualHost *:80 has no VirtualHosts Dit probleem ontstaat als meerdere keren NameVirtualHost is gedefinieerd; Somewhere in your configuration, probably in the Apache default configuration file (I think /etc/apache2/httpd.conf in Ubuntu? someone can correct me in the comments), is a line that looks like: