I am having a rough time running apache and using multiple domain names

here is a snippet of my config file. I keep getting a error saying that NameVirtualHost has no VirtualHosts. I want them both running on the same IP and I'm not sure why this doesn't work. I've been digging through the documentation for VirtualHosts, NameVirtualHost, and apache's page about name based virtual hosting.

That example in the name based page is almost exactly my config! What am I doing wrong?

Listen *:80
NameVirtualHost *:80

<VirtualHost *:80>
   ServerName www.sample1.net
   DocumentRoot /var/www/sample1-net

</VirtualHost>

<VirtualHost *:80>
   ServerName www.example2.net
   DocumentRoot /var/www/example2-net

</VirtualHost>