I'm using Mamp Pro in OS X Mavericks when I start it I get error saying The built in apache is active which can cause a port conflict with at least one of your virtual host.
What should I do?
Open terminal, and use those command:
$ sudo apachectl stop
$ sudo launchctl unload -w /System/Library/LaunchDaemons/org.apache.httpd.plist
Restart your Mac if needed.