Homebrew: fatal: Needed a single revision
$ brew update Checking out v1.0.1 in /usr/local/Homebrew… To checkout master in /usr/local/Homebrew run: ‘cd /usr/local/Homebrew && git checkout master Checking out v1.0.1 in /usr/local/Homebrew/Library/Taps/caskroom/homebrew-cask… To checkout master in /usr/local/Homebrew/Library/Taps/caskroom/homebrew-cask run: ‘cd /usr/local/Homebrew/Library/Taps/caskroom/homebrew-cask && git checkout master fatal: Cannot update paths and switch to branch ‘v1.0.1’ at the same time. Did you intend to checkout ‘refs/tags/1.0.1’ which can not be resolved as commit? fatal: Needed a single revision invalid upstream refs/tags/1.0.1 Checking out v1.0.1 in /usr/local/Homebrew/Library/Taps/caskroom/homebrew-versions… To checkout master in…