Heroku Build Log

-----> Ruby app detected

-----> Compiling Ruby/Rails

-----> Using Ruby version: ruby-2.3.4

-----> Installing dependencies using bundler 1.15.2

       Running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin -j4 --deployment

       Warning: the running version of Bundler (1.15.2) is older than the version that created the lockfile (1.16.0.pre.3). We suggest you upgrade to the latest version of Bundler by running `gem install bundler --pre`.

       Fetching gem metadata from https://rubygems.org/.........

       Fetching version metadata from https://rubygems.org/..

       Fetching dependency metadata from https://rubygems.org/.

       Using rake 12.3.0

       Using concurrent-ruby 1.0.5

       Using minitest 5.10.3

       Using thread_safe 0.3.6

       Using builder 3.2.3

       Using erubi 1.7.0

       Using mini_portile2 2.3.0

       Using crass 1.0.3

       Using rack 2.0.3

       Using nio4r 2.2.0

       Using websocket-extensions 0.1.3

       Using mini_mime 1.0.0

       Using arel 8.0.0

       Using bundler 1.15.2

       Using coffee-script-source 1.12.2

       Using execjs 2.7.0

       Using method_source 0.9.0

       Using thor 0.20.0

       Using ffi 1.9.18

       Using multi_json 1.12.2

       Using pg 0.21.0

       Using puma 3.11.0

       Using rb-fsevent 0.10.2

       Using tilt 2.0.8

       Using tzinfo 1.2.4

       Using nokogiri 1.8.1

       Using i18n 0.9.1

       Using websocket-driver 0.6.5

       Using rack-test 0.8.2

       Fetching rack-proxy 0.6.4

       Using sprockets 3.7.1

       Using mail 2.7.0

       Using coffee-script 2.4.1

       Using uglifier 4.1.2

       Using rb-inotify 0.9.10

       Using activesupport 5.1.4

       Using loofah 2.1.1

       Using sass-listen 4.0.0

       Using rails-dom-testing 2.0.3

       Using globalid 0.4.1

       Using activemodel 5.1.4

       Using jbuilder 2.7.0

       Using sass 3.5.4

       Using rails-html-sanitizer 1.0.3

       Using activejob 5.1.4

       Using activerecord 5.1.4

       Using actionview 5.1.4

       Using actionpack 5.1.4

       Using actioncable 5.1.4

       Using actionmailer 5.1.4

       Using railties 5.1.4

       Using sprockets-rails 3.2.1

       Using coffee-rails 4.2.2

       Using rails 5.1.4

       Using sass-rails 5.0.7

       Installing rack-proxy 0.6.4

       Fetching webpacker 3.3.1

       Installing webpacker 3.3.1

       Bundle complete! 17 Gemfile dependencies, 56 gems now installed.

       Gems in the groups development and test were not installed.

       Bundled gems are installed into ./vendor/bundle.

       Bundle completed (3.35s)

       Cleaning up the bundler cache.

       Warning: the running version of Bundler (1.15.2) is older than the version that created the lockfile (1.16.0.pre.3). We suggest you upgrade to the latest version of Bundler by running `gem install bundler --pre`.

       Removing rack-proxy (0.6.3)

       Removing webpacker (3.2.0)

       The latest bundler is 1.16.1, but you are currently running 1.15.2.

       To update, run `gem install bundler`

-----> Installing node-v6.11.1-linux-x64

-----> Installing yarn-v1.0.2

-----> Detecting rake tasks

-----> Preparing app for Rails asset pipeline

       Running: rake assets:precompile

       yarn install v1.0.2

       [1/4] Resolving packages...

       [2/4] Fetching packages...

       info fsevents@1.1.3: The platform "linux" is incompatible with this module.

       info "fsevents@1.1.3" is an optional dependency and failed compatibility check. Excluding it from installation.

       [3/4] Linking dependencies...

       warning "babel-loader@7.1.2" has incorrect peer dependency "babel-core@6 || 7 || ^7.0.0-alpha || ^7.0.0-beta || ^7.0.0-rc".

       warning "babel-loader@7.1.2" has incorrect peer dependency "webpack@2 || 3".

       warning "compression-webpack-plugin@1.1.3" has incorrect peer dependency "webpack@^2.0.0 || ^3.0.0".

       warning "extract-text-webpack-plugin@3.0.2" has incorrect peer dependency "webpack@^3.1.0".

       warning "file-loader@1.1.6" has incorrect peer dependency "webpack@^2.0.0 || ^3.0.0".

       warning "postcss-cssnext@3.0.2" has incorrect peer dependency "caniuse-lite@^1.0.30000697".

       warning "sass-loader@6.0.6" has incorrect peer dependency "node-sass@^4.0.0".

       warning "sass-loader@6.0.6" has incorrect peer dependency "webpack@^2.0.0 || >= 3.0.0-rc.0 || ^3.0.0".

       warning "webpack-manifest-plugin@1.3.2" has incorrect peer dependency "webpack@1 || 2 || 3".

       warning "ajv-keywords@2.1.1" has incorrect peer dependency "ajv@^5.0.0".

       warning "uglifyjs-webpack-plugin@0.4.6" has incorrect peer dependency "webpack@^1.9 || ^2 || ^2.1.0-beta || ^2.2.0-rc || ^3.0.0".

       warning "webpack-dev-server@2.9.7" has incorrect peer dependency "webpack@^2.2.0 || ^3.0.0".

       warning "webpack-dev-middleware@1.12.2" has incorrect peer dependency "webpack@^1.0.0 || ^2.0.0 || ^3.0.0".

       [4/4] Building fresh packages...

       Done in 34.74s.

       I, [2018-03-21T17:19:47.030783 #387]  INFO -- : Writing /tmp/build_f18e594f7966bd80b565c49de7015c56/zerovolts-kanjibenkyo-9786c55/public/assets/application-cd73d1552675a34bd4336ff06a130dcadb6dbbb530c541b7df5a0c8eb3c170f3.css

       I, [2018-03-21T17:19:47.031590 #387]  INFO -- : Writing /tmp/build_f18e594f7966bd80b565c49de7015c56/zerovolts-kanjibenkyo-9786c55/public/assets/application-cd73d1552675a34bd4336ff06a130dcadb6dbbb530c541b7df5a0c8eb3c170f3.css.gz

       Webpacker is installed 🎉 🍰

       Using /tmp/build_f18e594f7966bd80b565c49de7015c56/zerovolts-kanjibenkyo-9786c55/config/webpacker.yml file for setting up webpack paths

       Compiling…

       Compilation failed:

       Warning: the running version of Bundler (1.15.2) is older than the version that created the lockfile (1.16.0.pre.3). We suggest you upgrade to the latest version of Bundler by running `gem install bundler --pre`.

       Fetching gem metadata from https://rubygems.org/..........

       Fetching version metadata from https://rubygems.org/...

       Fetching dependency metadata from https://rubygems.org/..

       Using rake 12.3.0

       Using concurrent-ruby 1.0.5

       Using minitest 5.10.3

       Using thread_safe 0.3.6

       Using builder 3.2.3

       Using erubi 1.7.0

       Using mini_portile2 2.3.0

       Using crass 1.0.3

       Using rack 2.0.3

       Using nio4r 2.2.0

       Using websocket-extensions 0.1.3

       Using mini_mime 1.0.0

       Using arel 8.0.0

       Using bundler 1.15.2

       Using coffee-script-source 1.12.2

       Using execjs 2.7.0

       Using method_source 0.9.0

       Using thor 0.20.0

       Using ffi 1.9.18

       Using multi_json 1.12.2

       Using pg 0.21.0

       Using puma 3.11.0

       Using rb-fsevent 0.10.2

       Using tilt 2.0.8

       Using i18n 0.9.1

       Using tzinfo 1.2.4

       Using nokogiri 1.8.1

       Using websocket-driver 0.6.5

       Using rack-test 0.8.2

       Using rack-proxy 0.6.4

       Using sprockets 3.7.1

       Using mail 2.7.0

       Using coffee-script 2.4.1

       Using uglifier 4.1.2

       Using rb-inotify 0.9.10

       Using activesupport 5.1.4

       Using loofah 2.1.1

       Using sass-listen 4.0.0

       Using rails-dom-testing 2.0.3

       Using globalid 0.4.1

       Using activemodel 5.1.4

       Using jbuilder 2.7.0

       Using rails-html-sanitizer 1.0.3

       Using sass 3.5.4

       Using activejob 5.1.4

       Using activerecord 5.1.4

       Using actionview 5.1.4

       Using actionpack 5.1.4

       Using actioncable 5.1.4

       Using actionmailer 5.1.4

       Using railties 5.1.4

       Using sprockets-rails 3.2.1

       Using coffee-rails 4.2.2

       Using rails 5.1.4

       Using sass-rails 5.0.7

       Using webpacker 3.3.1

       Bundle complete! 17 Gemfile dependencies, 56 gems now installed.

       Gems in the groups development and test were not installed.

       Bundled gems are installed into ./vendor/bundle.

       The latest bundler is 1.16.1, but you are currently running 1.15.2.

       To update, run `gem install bundler`

       /tmp/build_f18e594f7966bd80b565c49de7015c56/zerovolts-kanjibenkyo-9786c55/vendor/bundle/ruby/2.3.0/gems/bundler-1.15.2/lib/bundler/rubygems_integration.rb:432:in `block in replace_bin_path': can't find executable webpack for gem webpacker (Gem::Exception)

       from /tmp/build_f18e594f7966bd80b565c49de7015c56/zerovolts-kanjibenkyo-9786c55/vendor/bundle/ruby/2.3.0/gems/bundler-1.15.2/lib/bundler/rubygems_integration.rb:463:in `block in replace_bin_path'

       from ./bin/webpack:21:in `<main>'

 !

 !     Precompiling assets failed.

 !

 !     Push rejected, failed to compile Ruby app.

 !     Push failed