brew cask error

log.txt

# brew update && brew upgrade brew-cask && brew cleanup && brew cask cleanup
Already up-to-date.
Error: brew-cask-0.49.0 already installed

# brew cask install screenhero
==> Downloading http://dl.screenhero.com/update/screenhero/Screenhero.dmg
Already downloaded: /Library/Caches/Homebrew/screenhero-latest.dmg
Error: undefined method `extname' for nil:NilClass
Please report this bug:
    https://github.com/caskroom/homebrew-cask/issues
/usr/local/Cellar/brew-cask/0.49.0/rubylib/cask/container/criteria.rb:43:in `extension'
/usr/local/Cellar/brew-cask/0.49.0/rubylib/cask/container/pkg.rb:3:in `me?'
/usr/local/Cellar/brew-cask/0.49.0/rubylib/cask/container.rb:50:in `block in for_path'
/usr/local/Cellar/brew-cask/0.49.0/rubylib/cask/container.rb:48:in `each'
/usr/local/Cellar/brew-cask/0.49.0/rubylib/cask/container.rb:48:in `find'
/usr/local/Cellar/brew-cask/0.49.0/rubylib/cask/container.rb:48:in `for_path'
/usr/local/Cellar/brew-cask/0.49.0/rubylib/cask/installer.rb:85:in `extract_primary_container'
/usr/local/Cellar/brew-cask/0.49.0/rubylib/cask/installer.rb:52:in `install'
/usr/local/Cellar/brew-cask/0.49.0/rubylib/cask/cli/install.rb:20:in `block in install_casks'
/usr/local/Cellar/brew-cask/0.49.0/rubylib/cask/cli/install.rb:17:in `each'
/usr/local/Cellar/brew-cask/0.49.0/rubylib/cask/cli/install.rb:17:in `install_casks'
/usr/local/Cellar/brew-cask/0.49.0/rubylib/cask/cli/install.rb:6:in `run'
/usr/local/Cellar/brew-cask/0.49.0/rubylib/cask/cli.rb:81:in `run_command'
/usr/local/Cellar/brew-cask/0.49.0/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:in `require'
/usr/local/Library/brew.rb:59:in `require?'
/usr/local/Library/brew.rb:142:in `<main>'


# brew cask doctor
==> OS X Version:
10.10.1
==> Hardware Architecture:
intel-64
==> Ruby Version:
2.0.0-p481
==> Ruby Path:
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby
==> Homebrew Version:
0.9.5
==> 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:
0.49.0
==> Homebrew-cask Install Location:
/usr/local/Cellar/brew-cask/0.49.0
==> Homebrew-cask Staging Location:
/opt/homebrew-cask/Caskroom
==> Homebrew-cask Cached Downloads:
/Library/Caches/Homebrew
/Library/Caches/Homebrew/Casks
0 files
0.00 megs
==> Homebrew-cask Default Tap Path:
/usr/local/Library/Taps/caskroom/homebrew-cask
==> Homebrew-cask Alternate Cask Taps:
/usr/local/Library/Taps/caskroom/homebrew-versions
==> Homebrew-cask Default Tap Cask Count:
2155
==> Contents of $LOAD_PATH:
/usr/local/Cellar/brew-cask/0.49.0/rubylib
/usr/local/Library/Homebrew
/Library/Ruby/Site/2.0.0
/Library/Ruby/Site/2.0.0/x86_64-darwin14
/Library/Ruby/Site/2.0.0/universal-darwin14
/Library/Ruby/Site
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/vendor_ruby/2.0.0
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/vendor_ruby/2.0.0/x86_64-darwin14
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/vendor_ruby/2.0.0/universal-darwin14
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/vendor_ruby
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/x86_64-darwin14
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/universal-darwin14
==> Contents of $RUBYLIB Environment Variable:
<NONE>
==> Contents of $RUBYOPT Environment Variable:
<NONE>
==> Contents of $RUBYPATH Environment Variable:
<NONE>
==> Contents of $RBENV_VERSION Environment Variable:
<NONE>
==> Contents of $CHRUBY_VERSION Environment Variable:
<NONE>
==> Contents of $GEM_HOME Environment Variable:
<NONE>
==> Contents of $GEM_PATH Environment Variable:
<NONE>
==> Contents of $BUNDLE_PATH Environment Variable:
<NONE>
==> Contents of $PATH Environment Variable:
PATH="/usr/local/sbin:/usr/local/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin"
==> Contents of $SHELL Environment Variable:
SHELL="/bin/bash"
==> Contents of Locale Environment Variables:
LC_CTYPE="en_US.UTF-8"
==> Running As Privileged User:
No