【macOS】「brew install」でエラー（「Traceback (most recent call last): 」）が出たときの対処法

2022/05/01

「brew install」でエラーが出た

「brew install」実行したらエラーが。

$ brew install

Traceback (most recent call last):
	11: from /usr/local/Homebrew/Library/Homebrew/brew.rb:31:in `<main>'
	10: from /usr/local/Homebrew/Library/Homebrew/brew.rb:31:in `require_relative'
	 9: from /usr/local/Homebrew/Library/Homebrew/global.rb:80:in `<top (required)>'
	 8: from /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.6.3_2/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 7: from /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.6.3_2/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 6: from /usr/local/Homebrew/Library/Homebrew/os.rb:7:in `<top (required)>'
	 5: from /usr/local/Homebrew/Library/Homebrew/os.rb:43:in `<module:OS>'
	 4: from /usr/local/Homebrew/Library/Homebrew/os/mac.rb:60:in `prerelease?'
	 3: from /usr/local/Homebrew/Library/Homebrew/os/mac.rb:28:in `version'
	 2: from /usr/local/Homebrew/Library/Homebrew/os/mac/version.rb:33:in `from_symbol'
	 1: from /usr/local/Homebrew/Library/Homebrew/os/mac/version.rb:33:in `fetch'
/usr/local/Homebrew/Library/Homebrew/os/mac/version.rb:33:in `block in from_symbol': unknown or unsupported macOS version: :dunno (MacOSVersionError)

こんなエラーの時は、
このコマンドを実行するとリセットできるみたいです！