Error: undefined method `gray' for Tty:Module

[ilovezfs]

==> brew install --build-bottle --verbose mobile-shell
==> brew style mobile-shell
==> brew audit mobile-shell
==> brew bottle --verbose --json mobile-shell
==> FAILED
==> Determining mobile-shell bottle rebuild...
==> Bottling mobile-shell-1.2.6_4.el_capitan.bottle.tar.gz...
tar cf /Users/brew/Jenkins/pr-core/version/el_capitan/mobile-shell-1.2.6_4.el_capitan.bottle.tar mobile-shell/1.2.6_4
gzip -f mobile-shell-bottle.tar
Warning: String '/usr/local/Cellar' still exists in these files:
/usr/local/Cellar/mobile-shell/1.2.6_4/bin/mosh-client
Error: undefined method `gray' for Tty:Module
Please report this bug:
  https://git.io/brew-troubleshooting
/usr/local/Homebrew/Library/Homebrew/dev-cmd/bottle.rb:96:in `block (2 levels) in keg_contain?'
/usr/local/Homebrew/Library/Homebrew/dev-cmd/bottle.rb:95:in `each'
/usr/local/Homebrew/Library/Homebrew/dev-cmd/bottle.rb:95:in `block in keg_contain?'
/usr/local/Homebrew/Library/Homebrew/keg_relocate.rb:57:in `block in each_unique_file_matching'
/usr/local/Homebrew/Library/Homebrew/utils/popen.rb:18:in `block in popen'
/usr/local/Homebrew/Library/Homebrew/utils/popen.rb:15:in `popen'
/usr/local/Homebrew/Library/Homebrew/utils/popen.rb:15:in `popen'
/usr/local/Homebrew/Library/Homebrew/utils/popen.rb:3:in `popen_read'
/usr/local/Homebrew/Library/Homebrew/keg_relocate.rb:51:in `each_unique_file_matching'
/usr/local/Homebrew/Library/Homebrew/dev-cmd/bottle.rb:63:in `keg_contain?'
/usr/local/Homebrew/Library/Homebrew/dev-cmd/bottle.rb:251:in `block in bottle_formula'
/usr/local/Homebrew/Library/Homebrew/keg.rb:250:in `block in lock'
/usr/local/Homebrew/Library/Homebrew/formula_lock.rb:25:in `with_lock'
/usr/local/Homebrew/Library/Homebrew/keg.rb:246:in `lock'
/usr/local/Homebrew/Library/Homebrew/dev-cmd/bottle.rb:186:in `bottle_formula'
/usr/local/Homebrew/Library/Homebrew/dev-cmd/bottle.rb:478:in `block in bottle'
/usr/local/Homebrew/Library/Homebrew/dev-cmd/bottle.rb:477:in `each'
/usr/local/Homebrew/Library/Homebrew/dev-cmd/bottle.rb:477:in `bottle'
/usr/local/Homebrew/Library/Homebrew/brew.rb:99:in `<main>'
==> brew test mobile-shell --verbose
==> brew uninstall --force mobile-shell
==> brew uninstall --force autoconf automake cmake doxygen libevent libtool makedepend openssl pkg-config protobuf sphinx-doc tmux xz
==> git checkout master -f

https://bot.brew.sh/job/Homebrew%20Core%20Pull%20Requests/8588/version=el_capitan/console