Error with brew cask install fiji

[nerduno]

When attempting to install fiji using brew cask install fiji, I receive the following error:

brew cask install fiji
==> Downloading http://jenkins.imagej.net/job/Stable-Fiji-MacOSX/lastSuccessfulBuild/artifact/fiji-macosx.dmg

################################################################## 100.0%

Error: undefined method extname' for 0:Fixnum Please report this bug: https://github.com/caskroom/homebrew-cask/issues /usr/local/Cellar/brew-cask/0.46.0/rubylib/cask/container/criteria.rb:43:inextension'
/usr/local/Cellar/brew-cask/0.46.0/rubylib/cask/container/pkg.rb:3:in me?' /usr/local/Cellar/brew-cask/0.46.0/rubylib/cask/container.rb:50:inblock in for_path'
/usr/local/Cellar/brew-cask/0.46.0/rubylib/cask/container.rb:48:in each' /usr/local/Cellar/brew-cask/0.46.0/rubylib/cask/container.rb:48:infind'
/usr/local/Cellar/brew-cask/0.46.0/rubylib/cask/container.rb:48:in for_path' /usr/local/Cellar/brew-cask/0.46.0/rubylib/cask/installer.rb:83:inextract_primary_container'
/usr/local/Cellar/brew-cask/0.46.0/rubylib/cask/installer.rb:50:in install' /usr/local/Cellar/brew-cask/0.46.0/rubylib/cask/cli/install.rb:20:inblock in install_casks'
/usr/local/Cellar/brew-cask/0.46.0/rubylib/cask/cli/install.rb:17:in each' /usr/local/Cellar/brew-cask/0.46.0/rubylib/cask/cli/install.rb:17:ininstall_casks'
/usr/local/Cellar/brew-cask/0.46.0/rubylib/cask/cli/install.rb:6:in run' /usr/local/Cellar/brew-cask/0.46.0/rubylib/cask/cli.rb:81:inrun_command'
/usr/local/Cellar/brew-cask/0.46.0/rubylib/cask/cli.rb:121:in process' /usr/local/bin/brew-cask.rb:42:in<top (required)>'
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in require' /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:inrequire'
/usr/local/Library/brew.rb:59:in require?' /usr/local/Library/brew.rb:142:in

'

[tapeinosyne]

Hello @nerduno. You are encountering #7946, which affects outdated versions of brew-cask. Upgrading should fix the issue:

brew update && brew upgrade brew-cask && brew cleanup && brew cask cleanup

If it does not, let me know.