usr/local/Cellar/brew-cask/0.39.3/rubylib/cask/installer.rb:32:in `install ' /usr/local/Cellar/brew-cask/0.39.3/rubylib/cask/cli/install.rb:20:in `block in install_casks ' /usr/local/Cellar/brew-cask/0.39.3/rubylib/cask/cli/install.rb:17:in `each ' /usr/local/Cellar/brew-cask/0.39.3/rubylib/cask/cli/install.rb:17:in `install_casks ' System/Library/Frameworks/amework/Versions/2.0/usr/lib/ruby/2.0.0/fileutils.rb:217:in `block in mkdir_p ' /System/Library/Frameworks/amework/Versions/2.0/usr/lib/ruby/2.0.0/fileutils.rb:203:in `each ' /System/Library/Frameworks/amework/Versions/2.0/usr/lib/ruby/2.0.0/fileutils.rb:203:in `mkdir_p ' /usr/local/Cellar/brew-cask/0.39.3/rubylib/cask/installer.rb:61:in `extract_primary_container ' System/Library/Frameworks/amework/Versions/2.0/usr/lib/ruby/2.0.0/fileutils.rb:245:in `mkdir ' /System/Library/Frameworks/amework/Versions/2.0/usr/lib/ruby/2.0.0/fileutils.rb:245:in `fu_mkdir ' /System/Library/Frameworks/amework/Versions/2.0/usr/lib/ruby/2.0.0/fileutils.rb:219:in `block (2 levels) in mkdir_p ' /System/Library/Frameworks/amework/Versions/2.0/usr/lib/ruby/2.0.0/fileutils.rb:217:in `reverse_each '

Already downloaded: /Library/Caches/Homebrew/virtualbox-4.3.14-95030.dmgĮrror: Permission denied - /opt/homebrew-cask/Caskroom/virtualbox

Brew install virtualbox