Fixing ‘vagrant up’ after OSX Mavericks update

There was an error while executing VBoxManage, a CLI used by Vagrant
for controlling VirtualBox. The command and stderr is shown below.

The fix:
sudo launchctl load /Library/LaunchDaemons/org.virtualbox.startup.plist

That command start VirtualBox, the app which runs the Vagrant box. The next vagrant up try works and I'm up and working again!