When trying to add a Vhost in Apache the error that keeps occuring is:

documentRoot takes one argument, Root directory of the document

What does that mean? here is the code i used to add it:

<VirtualHost *:80>
ServerName http://www.almost-online.net
ServerAdmin webmaster@theouternet.net
DocumentRoot C:\Program Files\Apache Group\Apache\htdocs\Usr\justin
</VirtualHost>

Whats wrong with that?