Tapping on Mac

FYI:

Cloning into '/usr/local/Homebrew/Library/Taps/amanda/homebrew-tap'...
remote: Enumerating objects: 7, done.
remote: Counting objects: 100% (7/7), done.
remote: Compressing objects: 100% (7/7), done.
remote: Total 7 (delta 0), reused 0 (delta 0)
Unpacking objects: 100% (7/7), done.
Error: Invalid formula: /usr/local/Homebrew/Library/Taps/amanda/homebrew-tap/Formula/chezmoi.rb
chezmoi: undefined method `macos?' for OS:Module
Did you mean?  mac?
Error: Invalid formula: /usr/local/Homebrew/Library/Taps/amanda/homebrew-tap/Formula/gitbatch.rb
gitbatch: undefined method `macos?' for OS:Module
Did you mean?  mac?
Error: Cannot tap amanda/tap: invalid syntax in tap!
Error: No available formula with the name "gitbatch"
==> Searching for a previously deleted formula (in the last month)...
Error: No previously deleted formula found.
==> Searching for similarly named formulae...
Error: No similarly named formulae found.
==> Searching taps...
==> Searching taps on GitHub...
Error: No formulae found in taps.