Getting a 403 when uncommenting last line in the httpd.conf file

I installed Bitnami on an AWS EC2 instance, and everything worked great until I tried adding a second domain to the server.

In order to create a virtual host, the Bitnami documentation suggests uncommenting the last line in the /opt/bitnami/apache2/conf/httpd.conf file, which reads like this:

Include "conf/extra/httpd-vhosts.conf"

But when I did this and restarted apache, I got a 403 error in the browser whenever I tried to access any domain pointing to that AWS IP — regardless of whether the domain is inside that httpd-vhosts.conf file or not. This is very strange. When I comment out the line again and

Any suggestions? on what I'm doing wrong?