Homebrew error occurred when I command “brew cask install virtualbox” or “brew cask search google-chrome”

Question

I\'m trying to install virtual box with brew-cask, but That returns this kind of error and I cannot install virtualbox. I use MacOSX Lion 10.7.5 and homebrew 0.9.5, ruby 2.1.0-p

Answer 1

brew install caskroom/cask/brew-cask
brew install homebrew/completions/brew-cask-completion

That worked for me