heroku関連です。助けてください。

Application error
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が出て、色々調べてやってみましたが一向に進みません。

Counting objects: 4, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (4/4), done.
Writing objects: 100% (4/4), 411 bytes | 0 bytes/s, done.
Total 4 (delta 3), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote: 
remote: -----> Ruby app detected
remote: -----> Compiling Ruby/Rails
remote: -----> Using Ruby version: ruby-2.2.1
remote: -----> Installing dependencies using bundler 1.15.1
remote:        Ruby version change detected. Clearing bundler cache.
remote:        Old: ruby 2.3.4p301 (2017-03-30 revision 58214) [x86_64-linux]
remote:        New: ruby 2.2.1p85 (2015-02-26 revision 49769) [x86_64-linux]
remote:        Running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin -j4 --deployment
remote:        Your Gemfile lists the gem nokogiri (>= 0) more than once.
remote:        You should probably keep only one of them.
remote:        While it's not a problem now, it could cause errors if you change the version of one of them later.
remote:        Fetching gem metadata from https://rubygems.org/..........
remote:        Fetching version metadata from https://rubygems.org/..
remote:        Fetching dependency metadata from https://rubygems.org/.
remote:        Fetching rake 12.0.0
remote:        Fetching rails_serve_static_assets 0.0.5
remote:        Fetching rails_stdout_logging 0.0.5
remote:        Installing rails_stdout_logging 0.0.5
remote:        Installing rake 12.0.0
remote:        Fetching mini_portile2 2.1.0
remote:        Fetching i18n 0.8.1
remote:        Installing mini_portile2 2.1.0
remote:        Installing rails_serve_static_assets 0.0.5
remote:        Installing i18n 0.8.1
remote:        Fetching json 1.8.6
remote:        Installing json 1.8.6 with native extensions
remote:        Fetching minitest 5.10.2
remote:        Installing minitest 5.10.2
remote:        Fetching thread_safe 0.3.6
remote:        Fetching builder 3.2.3
remote:        Installing thread_safe 0.3.6
remote:        Installing builder 3.2.3
remote:        Fetching erubis 2.7.0
remote:        Installing erubis 2.7.0
remote:        Fetching rack 1.6.8
remote:        Installing rack 1.6.8
remote:        Fetching mime-types-data 3.2016.0521
remote:        Fetching arel 6.0.4
remote:        Installing arel 6.0.4
remote:        Installing mime-types-data 3.2016.0521
remote:        Fetching thor 0.19.4
remote:        Installing thor 0.19.4
remote:        Fetching concurrent-ruby 1.0.5
remote:        Using bundler 1.15.1
remote:        Fetching pg 0.21.0
remote:        Installing concurrent-ruby 1.0.5
remote:        Installing pg 0.21.0 with native extensions
remote:        Fetching sass 3.4.24
remote:        Installing sass 3.4.24
remote:        Fetching tilt 2.0.7
remote:        Installing tilt 2.0.7
remote:        Fetching execjs 2.7.0
remote:        Installing execjs 2.7.0
remote:        Fetching coffee-script-source 1.12.2
remote:        Installing coffee-script-source 1.12.2
remote:        Fetching turbolinks-source 5.0.3
remote:        Installing turbolinks-source 5.0.3
remote:        Fetching multi_json 1.12.1
remote:        Installing multi_json 1.12.1
remote:        Fetching rdoc 4.3.0
remote:        Installing rdoc 4.3.0
remote:        Fetching nokogiri 1.7.2
remote:        Installing nokogiri 1.7.2 with native extensions
remote:        Fetching rails_12factor 0.0.3
remote:        Installing rails_12factor 0.0.3
remote:        Fetching tzinfo 1.2.3
remote:        Installing tzinfo 1.2.3
remote:        Fetching rack-test 0.6.3
remote:        Installing rack-test 0.6.3
remote:        Fetching mime-types 3.1
remote:        Installing mime-types 3.1
remote:        Fetching sprockets 3.7.1
remote:        Installing sprockets 3.7.1
remote:        Fetching uglifier 3.2.0
remote:        Installing uglifier 3.2.0
remote:        Fetching coffee-script 2.4.1
remote:        Installing coffee-script 2.4.1
remote:        Fetching turbolinks 5.0.1
remote:        Installing turbolinks 5.0.1
remote:        Fetching mail 2.6.5
remote:        Installing mail 2.6.5
remote:        Fetching loofah 2.0.3
remote:        Installing loofah 2.0.3
remote:        Fetching rails-html-sanitizer 1.0.3
remote:        Installing rails-html-sanitizer 1.0.3
remote:        Fetching activesupport 4.2.1
remote:        Fetching sdoc 0.4.2
remote:        Installing sdoc 0.4.2
remote:        Installing activesupport 4.2.1
remote:        Fetching rails-deprecated_sanitizer 1.0.3
remote:        Fetching globalid 0.4.0
remote:        Fetching activemodel 4.2.1
remote:        Installing globalid 0.4.0
remote:        Installing rails-deprecated_sanitizer 1.0.3
remote:        Fetching jbuilder 2.6.4
remote:        Fetching activejob 4.2.1
remote:        Installing jbuilder 2.6.4
remote:        Fetching rails-dom-testing 1.0.8
remote:        Installing rails-dom-testing 1.0.8
remote:        Installing activemodel 4.2.1
remote:        Fetching actionview 4.2.1
remote:        Installing activejob 4.2.1
remote:        Installing actionview 4.2.1
remote:        Fetching activerecord 4.2.1
remote:        Fetching actionpack 4.2.1
remote:        Installing actionpack 4.2.1
remote:        Fetching railties 4.2.1
remote:        Fetching actionmailer 4.2.1
remote:        Installing activerecord 4.2.1
remote:        Installing actionmailer 4.2.1
remote:        Installing railties 4.2.1
remote:        Fetching sprockets-rails 3.2.0
remote:        Installing sprockets-rails 3.2.0
remote:        Fetching sass-rails 5.0.6
remote:        Fetching coffee-rails 4.1.1
remote:        Fetching rails 4.2.1
remote:        Installing coffee-rails 4.1.1
remote:        Installing sass-rails 5.0.6
remote:        Fetching jquery-rails 4.3.1
remote:        Installing jquery-rails 4.3.1
remote:        Installing rails 4.2.1
remote:        Bundle complete! 18 Gemfile dependencies, 54 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 (22.87s)
remote:        Cleaning up the bundler cache.
remote:        Your Gemfile lists the gem nokogiri (>= 0) more than once.
remote:        You should probably keep only one of them.
remote:        While it's not a problem now, it could cause errors if you change the version of one of them later.
remote: -----> Installing node-v6.10.0-linux-x64
remote: -----> Detecting rake tasks
remote: -----> Preparing app for Rails asset pipeline
remote:        Running: rake assets:precompile
remote:        Asset precompilation completed (5.17s)
remote:        Cleaning assets
remote:        Running: rake assets:clean
remote: 
remote: -----> Discovering process types
remote:        Procfile declares types     -> redis, web, worker
remote:        Default types for buildpack -> console, rake
remote: 
remote: -----> Compressing...
remote:        Done: 38.4M
remote: -----> Launching...
remote:        Released v9
remote:        https://timebox-0702.herokuapp.com/ deployed to Heroku
remote: 
remote: Verifying deploy... done.