missing def

Gemfile-v3

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+source "https://rubygems.org"
+
+gem "middleman-core", :github => "middleman/middleman", :branch => "v3-stable"
+
+# Specify your gem's dependencies in middleman-sprockets.gemspec
+gemspec
+
+gem "rake", "~> 10.0.3", :require => false
+gem "yard", "~> 0.8.0", :require => false
+
+# gem "sprockets", "3.0.0.beta.3"
+# gem 'sprockets-helpers', path: '~/Sites/sprockets-helpers'
+# gem 'sprockets-sass', path: '~/Sites/sprockets-sass'
+
+# Test tools
+gem "cucumber"
+gem "fivemat", "~> 1.2.1"
+gem "aruba"
+gem "rspec", "~> 3.0"
+gem "builder", "~> 3.0"
+gem "simplecov"
+
+# For actual tests
+# Make sure to lock down the versions of the asset gems
+# so they don't cause asset hashes to change.
+gem "railties", "~> 4.1"
+gem "jquery-rails", "3.1.0", :require => false
+gem "bootstrap-sass", "3.1.1.0", :require => false
+gem "jquery_mobile_rails", "1.4.1", :require => false
+
+gem "ejs", "~> 1.1.1"
+gem "eco", "~> 1.0.0"
+gem "erubis", "~> 2.7.0"
+
+# Code Quality
+gem "cane", :platforms => [:mri_19, :mri_20], :require => false