Guard error

Gemfile

source 'https://rubygems.org'

ruby IO.read(File.expand_path("../.ruby-version", __FILE__)).chomp

gem 'rails', '~> 5.0.0'

gem 'mysql2'

gem 'puma'
gem 'rails_12factor', group: :production
gem 'test-unit', '~> 3.0'

gem 'rollbar', '~> 2.8'
gem 'skylight'

gem 'sidekiq', '< 5'
gem 'sprockets', require: nil

gem 'devise', '~> 4.2'
gem 'omniauth-mlh'
gem 'httparty'

gem 'paperclip', '~> 5.0.0'
gem 'aws-sdk'

gem 'haml-rails'
gem 'simple_form'
gem 'kaminari'
gem 'ajax-datatables-rails'
gem 'roadie-rails'
gem 'chartkick', '~> 2.1'
gem 'groupdate'
gem 'font-awesome-rails', '~> 4.0' # needed for icon helpers

gem 'strip_attributes'

gem 'validate_url'

# Previously grouped under assets:
gem 'sass-rails'
gem 'coffee-rails'
gem 'jquery-rails'
gem 'jquery-ui-sass-rails'
gem 'jquery-datatables-rails', '~> 3.4.0'
gem 'selectize-rails'
gem 'highcharts-rails', '~> 4.2.5'
gem 'uglifier', '~> 3.0'

gem 'dotenv-rails', groups: [:development, :test]

group :development do
  gem 'better_errors'
  gem 'binding_of_caller'
  gem 'guard'
  gem 'guard-minitest'
  gem 'simplecov', require: false
end

group :test do
  gem 'shoulda'
  gem 'minitest-rails'
  gem 'minitest-reporters'
  gem 'valid_attribute'
  gem 'factory_girl_rails'
  gem 'codeclimate-test-reporter', '~> 0.6.0', require: nil
  gem 'rails-controller-testing' # Rails 4 fallback
end

guard.log

> stuart@stuart$ be guard --debug
Expected string default value for '--listen-on'; got false (boolean)
18:38:12 - DEBUG - Notiffany: gntp not available (Please add "gem 'ruby_gntp'" to your Gemfile and run your app with "bundle exec".).
18:38:12 - DEBUG - Notiffany: growl not available (Please add "gem 'growl'" to your Gemfile and run your app with "bundle exec".).
18:38:12 - DEBUG - Notiffany: terminal_notifier not available (Please add "gem 'terminal-notifier-guard'" to your Gemfile and run your app with "bundle exec".).
18:38:12 - DEBUG - Notiffany: libnotify not available (Unsupported platform "darwin16.3.0").
18:38:12 - DEBUG - Notiffany: notifysend not available (Unsupported platform "darwin16.3.0").
18:38:12 - DEBUG - Notiffany: notifu not available (Unsupported platform "darwin16.3.0").
18:38:12 - DEBUG - Command execution: {"ALTERNATE_EDITOR"=>"false"} emacsclient --eval '1'
18:38:12 - DEBUG - Notiffany: emacs not available (Emacs client failed).
18:38:12 - DEBUG - Notiffany: tmux not available (:tmux notifier is only available inside a TMux session.).
18:38:12 - DEBUG - Notiffany: file not available (No :path option given).
18:38:12 - DEBUG - Notiffany is using TerminalTitle to send notifications.
18:38:12 - DEBUG - Command execution: hash stty
18:38:12 - DEBUG - Guard starts all plugins
18:38:12 - DEBUG - Hook :start_begin executed for Guard::Minitest
18:38:12 - INFO - Guard::Minitest 2.4.6 is running, with Minitest::Unit 5.10.1!
18:38:12 - DEBUG - Hook :start_end executed for Guard::Minitest
18:38:13 - INFO - Guard is now watching at '/Users/stuart/dev/brickhack.io'
18:38:13 - DEBUG - Start interactor
18:38:13 - DEBUG - Command execution: stty -g 2>/dev/null
18:38:15 - DEBUG - Interactor was stopped or killed
18:38:15 - DEBUG - Command execution: stty  2>/dev/null
18:38:15 - ERROR - Problem with watch action!
> [#] undefined method `zero?' for 1..2:Range
18:38:15 - ERROR - /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/lib/guard/watcher/pattern/match_result.rb:12:in `[]'
> [#] /Users/stuart/dev/brickhack.io/Guardfile:3:in `block (2 levels) in evaluate'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/lib/guard/watcher.rb:75:in `call_action'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/lib/guard/watcher.rb:44:in `block (2 levels) in match_files'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/lib/guard/watcher.rb:39:in `each'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/lib/guard/watcher.rb:39:in `block in match_files'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/lib/guard/watcher.rb:38:in `each'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/lib/guard/watcher.rb:38:in `inject'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/lib/guard/watcher.rb:38:in `match_files'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/lib/guard/runner.rb:58:in `block (3 levels) in run_on_changes'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/lib/guard/runner.rb:56:in `each'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/lib/guard/runner.rb:56:in `block (2 levels) in run_on_changes'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/lib/guard/runner.rb:119:in `block (2 levels) in _run_group_plugins'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/lib/guard/runner.rb:117:in `each'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/lib/guard/runner.rb:117:in `block in _run_group_plugins'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/lib/guard/runner.rb:116:in `catch'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/lib/guard/runner.rb:116:in `_run_group_plugins'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/lib/guard/runner.rb:54:in `block in run_on_changes'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/lib/guard/runner.rb:53:in `each'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/lib/guard/runner.rb:53:in `run_on_changes'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/lib/guard/internals/queue.rb:24:in `process'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/lib/guard/commander.rb:43:in `start'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/lib/guard/cli/environments/valid.rb:16:in `start_guard'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/lib/guard/cli.rb:122:in `start'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/thor-0.19.4/lib/thor/command.rb:27:in `run'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/thor-0.19.4/lib/thor/invocation.rb:126:in `invoke_command'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/thor-0.19.4/lib/thor.rb:369:in `dispatch'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/thor-0.19.4/lib/thor/base.rb:444:in `start'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/lib/guard/aruba_adapter.rb:32:in `execute'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/lib/guard/aruba_adapter.rb:19:in `execute!'
> [#] /Users/stuart/dev/brickhack.io/vendor/ruby/2.4.0/gems/guard-2.14.0/bin/_guard-core:11:in `<main>'
18:38:15 - DEBUG - Start interactor
18:38:15 - DEBUG - Command execution: stty -g 2>/dev/null
[1] guard(main)>

Guardfile

# More info at https://github.com/guard/guard#readme
guard :minitest, all_on_start: false, all_after_pass: false, spring: "bin/rails test" do
  watch(%r{^app/controllers/(?:([^\/]+/))?(.+)\.rb$})  { |m| "test/controllers/#{m[1..2].join}_test.rb" }
end