brewインストールエラーpython

Warning: Cask 'bitpay' is unreadable: undefined method `method_missing_message' for Utils:Module Error: Cask 'fish' definition is invalid: invalid 'depends_on macos' value: ":snow_leopard"liujianzhangdeMacBook-Air:~ liujian.zhang$ cd/usr/local/Caskroom/

$ cd $(brew --repo); git fetch; git reset --hard origin/master
$ brew untap phinze/cask; brew untap caskroom/cask; brew uninstall --force brew-cask
$ brew cleanup; brew cask cleanup; brew update