homebrew-cask: Cannot unpack Jdownloader

Issue

Cannot install Jdownloader. After running brew cask install jdownloader, that’s what I get below.

jdownloader requires Java. You can install the latest version with

  brew cask install java

==> Downloading http://installer.jdownloader.org/JD2Setup.dmg
######################################################################## 100.0%
==> No checksum defined for Cask jdownloader, skipping verification
Error: Uh oh, could not figure out how to unpack '/Library/Caches/Homebrew/jdownloader-latest.dmg'

Java is already installed according to java -version though.

Here’s the output of brew doctor if that helps

Your system is ready to brew.

Here’s the output of brew cask doctor if that helps

==> OS X Release:
10.11
==> OS X Release with Patchlevel:
10.11.3
==> Hardware Architecture:
intel-64
==> Ruby Version:
2.0.0-p645
==> Ruby Path:
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby
==> Homebrew Version:
Homebrew 0.9.5 (git revision 277f; last commit 2016-03-09)
==> Homebrew Executable Path:
/usr/local/bin/brew
==> Homebrew Cellar Path:
/usr/local/Cellar
==> Homebrew Repository Path:
/usr/local
==> Homebrew Origin:
https://github.com/Homebrew/homebrew
==> Homebrew-cask Version:
0.60.0 (git revision 35bb6; last commit 3 hours ago)
Error: undefined method `join' for "/usr/local/Cellar":String
  Most likely, this means you have an outdated version of homebrew-cask. Please run:

      brew uninstall --force brew-cask; brew untap phinze/cask; brew update; brew cleanup; brew cask cleanup

  If this doesn’t fix the problem, please report this bug:

      https://github.com/caskroom/homebrew-cask#reporting-bugs

/usr/local/Library/Taps/caskroom/homebrew-cask/lib/hbc/cli/doctor.rb:186:in `render_install_location'
/usr/local/Library/Taps/caskroom/homebrew-cask/lib/hbc/cli/doctor.rb:15:in `run'
/usr/local/Library/Taps/caskroom/homebrew-cask/lib/hbc/cli.rb:83:in `run_command'
/usr/local/Library/Taps/caskroom/homebrew-cask/lib/hbc/cli.rb:121:in `process'
/usr/local/Library/Taps/caskroom/homebrew-cask/cmd/brew-cask.rb:26: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:in `require'
/usr/local/Library/brew.rb:21:in `require?'
/usr/local/Library/brew.rb:89:in `<main>'

Thank you for the help