Как исправить ошибку при запуске миграции на heroku?

При деплое ровно та же ошибка. а гем вот об этом: https://habrahabr.ru/post/111676/

Counting objects: 36, done.
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Compressing objects: 100% (34/34), done.
Writing objects: 100% (36/36), 5.41 KiB | 0 bytes/s, done.
Total 36 (delta 18), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> Using set buildpack heroku/ruby
remote: -----> Ruby app detected
remote: -----> Compiling Ruby/Rails
remote: -----> Using Ruby version: ruby-2.2.3
remote: -----> Installing dependencies using bundler 1.9.7
remote: Running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin -j4 --deployment
remote: Using rake 10.5.0
remote: Using i18n 0.7.0
remote: Using json 1.8.3
remote: Using minitest 5.8.4
remote: Using thread_safe 0.3.5
remote: Using builder 3.2.2
remote: Using erubis 2.7.0
remote: Using mini_portile2 2.0.0
remote: Using rack 1.6.4
remote: Using mime-types 2.99.1
remote: Using arel 6.0.3
remote: Using execjs 2.6.0
remote: Using bcrypt 3.1.10
remote: Using sass 3.4.21
remote: Using will_paginate 3.1.0
remote: Using bootstrap_form 2.3.0
remote: Using coffee-script-source 1.10.0
remote: Using thor 0.19.1
remote: Using commonjs 0.2.7
remote: Using concurrent-ruby 1.0.1
remote: Using daemon_controller 1.2.0
remote: Using orm_adapter 0.5.0
remote: Using diff-lcs 1.2.5
remote: Using event-calendar 2.3.3
remote: Using multi_json 1.11.2
remote: Using tilt 2.0.2
remote: Using mimemagic 0.3.0
remote: Using pg 0.18.4
remote: Using bundler 1.9.7
remote: Using rails_serve_static_assets 0.0.5
remote: Using rails_stdout_logging 0.0.4
remote: Using rspec-support 3.4.1
remote: Using faker 1.6.3
remote: Using tzinfo 1.2.2
remote: Using rdoc 4.2.2
remote: Using nokogiri 1.6.7.2
remote: Using rack-test 0.6.3
remote: Using warden 1.2.6
remote: Using mail 2.6.3
remote: Using autoprefixer-rails 6.3.3.1
remote: Using uglifier 2.7.2
remote: Using bootstrap-will_paginate 0.0.10
remote: Using coffee-script 2.4.1
remote: Using less 2.6.0
remote: Using sprockets 3.5.2
remote: Using rails_12factor 0.0.3
remote: Using rspec-core 3.4.3
remote: Using rspec-expectations 3.4.0
remote: Using activesupport 4.2.5.2
remote: Using loofah 2.0.3
remote: Using sdoc 0.4.1
remote: Using bootstrap-sass 3.3.6
remote: Using rspec-its 1.2.0
remote: Using rails-deprecated_sanitizer 1.0.3
remote: Using globalid 0.3.6
remote: Using activemodel 4.2.5.2
remote: Using climate_control 0.0.3
remote: Using jbuilder 2.4.1
remote: Using loop_dance 0.5.3
remote: Using rails-html-sanitizer 1.0.3
remote: Using rails-dom-testing 1.0.7
remote: Using activejob 4.2.5.2
remote: Using activerecord 4.2.5.2
remote: Using cocaine 0.5.8
remote: Using actionview 4.2.5.2
remote: Using actionpack 4.2.5.2
remote: Using paperclip 4.3.5
remote: Using actionmailer 4.2.5.2
remote: Using railties 4.2.5.2
remote: Using less-rails 2.7.1
remote: Using sprockets-rails 3.0.4
remote: Using simple_form 3.2.1
remote: Using coffee-rails 4.1.1
remote: Using responders 2.1.1
remote: Using font-awesome-rails 4.5.0.1
remote: Using jquery-rails 4.1.0
remote: Using momentjs-rails 2.11.0
remote: Using rails 4.2.5.2
remote: Using sass-rails 5.0.4
remote: Using turbolinks 2.5.3
remote: Using twitter-bootstrap-rails 3.2.2 from git://github.com/seyhunak/twitter-bootstrap-rails.git (at master)
remote: Using devise 3.5.6
remote: Bundle complete! 30 Gemfile dependencies, 82 gems now installed.
remote: Gems in the groups development and test were not installed.
remote: Bundled gems are installed into ./vendor/bundle.
remote: Bundle completed (0.43s)
remote: Cleaning up the bundler cache.
remote: Could not detect rake tasks
remote: ensure you can run `$ bundle exec rake -P` against your app with no environment variables present
remote: and using the production group of your Gemfile.
remote: rake aborted!
remote: NameError: undefined local variable or method `load_dancers' for #
remote: /tmp/build_c9c9c600ddb589484435969f3afe7790/vendor/bundle/ruby/2.2.0/gems/loop_dance-0.5.3/lib/loop_dance/railtie.rb:25:in `block in '
remote: /tmp/build_c9c9c600ddb589484435969f3afe7790/vendor/bundle/ruby/2.2.0/gems/railties-4.2.5.2/lib/rails/railtie.rb:237:in `instance_exec'
remote: /tmp/build_c9c9c600ddb589484435969f3afe7790/vendor/bundle/ruby/2.2.0/gems/railties-4.2.5.2/lib/rails/railtie.rb:237:in `block in run_tasks_blocks'
remote: /tmp/build_c9c9c600ddb589484435969f3afe7790/vendor/bundle/ruby/2.2.0/gems/railties-4.2.5.2/lib/rails/railtie.rb:245:in `each'
remote: /tmp/build_c9c9c600ddb589484435969f3afe7790/vendor/bundle/ruby/2.2.0/gems/railties-4.2.5.2/lib/rails/railtie.rb:245:in `each_registered_block'
remote: /tmp/build_c9c9c600ddb589484435969f3afe7790/vendor/bundle/ruby/2.2.0/gems/railties-4.2.5.2/lib/rails/railtie.rb:237:in `run_tasks_blocks'
remote: /tmp/build_c9c9c600ddb589484435969f3afe7790/vendor/bundle/ruby/2.2.0/gems/railties-4.2.5.2/lib/rails/application.rb:451:in `block in run_tasks_blocks'
remote: /tmp/build_c9c9c600ddb589484435969f3afe7790/vendor/bundle/ruby/2.2.0/gems/railties-4.2.5.2/lib/rails/engine/railties.rb:13:in `each'
remote: /tmp/build_c9c9c600ddb589484435969f3afe7790/vendor/bundle/ruby/2.2.0/gems/railties-4.2.5.2/lib/rails/engine/railties.rb:13:in `each'
remote: /tmp/build_c9c9c600ddb589484435969f3afe7790/vendor/bundle/ruby/2.2.0/gems/railties-4.2.5.2/lib/rails/application.rb:451:in `run_tasks_blocks'
remote: /tmp/build_c9c9c600ddb589484435969f3afe7790/vendor/bundle/ruby/2.2.0/gems/railties-4.2.5.2/lib/rails/engine.rb:453:in `load_tasks'
remote: /tmp/build_c9c9c600ddb589484435969f3afe7790/Rakefile:6:in `'
remote: /tmp/build_c9c9c600ddb589484435969f3afe7790/vendor/bundle/ruby/2.2.0/gems/rake-10.5.0/lib/rake/rake_module.rb:28:in `load'
remote: /tmp/build_c9c9c600ddb589484435969f3afe7790/vendor/bundle/ruby/2.2.0/gems/rake-10.5.0/lib/rake/rake_module.rb:28:in `load_rakefile'
remote: /tmp/build_c9c9c600ddb589484435969f3afe7790/vendor/bundle/ruby/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:689:in `raw_load_rakefile'
remote: /tmp/build_c9c9c600ddb589484435969f3afe7790/vendor/bundle/ruby/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:94:in `block in load_rakefile'
remote: /tmp/build_c9c9c600ddb589484435969f3afe7790/vendor/bundle/ruby/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:176:in `standard_exception_handling'
remote: /tmp/build_c9c9c600ddb589484435969f3afe7790/vendor/bundle/ruby/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:93:in `load_rakefile'
remote: /tmp/build_c9c9c600ddb589484435969f3afe7790/vendor/bundle/ruby/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:77:in `block in run'
remote: /tmp/build_c9c9c600ddb589484435969f3afe7790/vendor/bundle/ruby/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:176:in `standard_exception_handling'
remote: /tmp/build_c9c9c600ddb589484435969f3afe7790/vendor/bundle/ruby/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:75:in `run'
remote: /tmp/build_c9c9c600ddb589484435969f3afe7790/vendor/bundle/ruby/2.2.0/gems/rake-10.5.0/bin/rake:33:in `'
remote: vendor/bundle/bin/rake:16:in `load'
remote: vendor/bundle/bin/rake:16:in `'
remote:
remote: ###### WARNING:
remote: No Procfile detected, using the default web server (webrick)
remote: https://devcenter.heroku.com/articles/ruby-default...
remote:
remote:
remote: -----> Discovering process types
remote: Procfile declares types -> (none)
remote: Default types for buildpack -> console, rake, web, worker
remote:
remote: -----> Compressing...
remote: Done: 48M
remote: -----> Launching...
remote: Released v7
remote: https://lit-sands-15636.herokuapp.com/ deployed to Heroku
remote:
remote: Verifying deploy.... done.