Update Error

[burtonageo]

When updating cask, I get the error:

Error: No such file or directory - /usr/local/Library/Formula/ab.rb
Please report this bug:
    https://github.com/caskroom/homebrew-cask/issues
/usr/local/Library/Homebrew/cmd/untap.rb:36:in `unlink'
/usr/local/Library/Homebrew/cmd/untap.rb:36:in `delete'
/usr/local/Library/Homebrew/cmd/untap.rb:36:in `block in unlink_tap_formula'
/usr/local/Library/Homebrew/cmd/untap.rb:32:in `each'
/usr/local/Library/Homebrew/cmd/untap.rb:32:in `unlink_tap_formula'
/usr/local/Library/Homebrew/cmd/update.rb:25:in `update'
/usr/local/Cellar/brew-cask/0.36.2/rubylib/cask/cli/update.rb:5:in `run'
/usr/local/Cellar/brew-cask/0.36.2/rubylib/cask/cli.rb:57:in `run_command'
/usr/local/Cellar/brew-cask/0.36.2/rubylib/cask/cli.rb:72: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:137:in `<main>'

Updating brew normally works as expected

[rolandwalker]

Thanks!

Relevant to #5080, this might be another case where we make an internal Homebrew call which is not stable. Also related: the exception is occurring within Homebrew, but the issues URL points back here.

However, I cannot duplicate this particular bug. My understanding is that you are running

$ brew cask update

which gives you an error, whereas

$ brew update

is working correctly.

brew cask update has no special functionality; it is supposed to be just a convenience synonym for brew update. So your workaround for the moment should be to run brew update instead.

0.36.2 is also not the newest version of Homebrew-cask, so you should also do

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

I would also check the output of brew doctor. It is possible that /usr/local/Library/Formula/ab.rb is a broken symlink or something like that.

[burtonageo]

Thank you, it now works after using your instructions. This issue can now be closed