The error message indicates that there is a disparity between the extension and VirtualBox versions. This can be because either of them is outdated or the extension ...
$ brew cask install virtualbox --verbose ==> Downloading http://download.virtualbox.org/virtualbox/5.0.8/VirtualBox-5.0.8-103449-OSX.dmg Already downloaded: /Library ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results