When making changes in your httpd-vhost.conf file, make sure to test it before reloading the apache config file or restarting apache.

Mac OSX

apachectl configtest

XAMPP OSX

/Applications/XAMPP/xamppfiles/bin/apachectl configtest

Errors should display, if there are any, otherwise you'll see the Syntax OK to indicate that there are no errors and you can reload the apache config file or restart apache.