Ruby on Rails App rails fails to push to heroku; webpacker error

Question

1. I am unable to push my Ruby on rails app to Heroku. I encounter errors using the heoku-20 stack.

project versions:

Ruby: ruby 2.6.6p146 (2020-03-31 revision 67876) [x86_64-linux]
Rails: 6.1.3
Webpacker: 5.2.1
Node: v10.24.0
Yarn: 1.22.5
@rails/webpacker: 
ipos@0.1.0 /home/ubuntu/environment/ipos
└── @rails/webpacker@5.2.1 
Is bin/webpack present?: true
Is bin/webpack-dev-server present?: true
Is bin/yarn present?: true

I get errors listed below when attempting to deploy:

ubuntu:~/environment/ipos (main) $ git push heroku main
Counting objects: 31772, done.
Compressing objects: 100% (15426/15426), done.
Writing objects: 100% (31772/31772), 36.47 MiB | 34.45 MiB/s, done.
Total 31772 (delta 15360), reused 31767 (delta 15359)
remote: Compressing source files... done.
remote: Building source:
remote: 
remote: -----> Building on the Heroku-20 stack
remote: -----> Using buildpacks:
remote:        1. https://github.com/heroku/heroku-buildpack-ruby#v217
remote:        2. heroku/nodejs
remote:        3. heroku/ruby
remote: -----> Ruby app detected
remote: -----> Installing bundler 1.17.3
remote: -----> Removing BUNDLED WITH version in the Gemfile.lock
remote: -----> Compiling Ruby/Rails
remote: -----> Using Ruby version: ruby-2.6.6
remote: -----> Installing dependencies using bundler 1.17.3
remote:        Running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin -j4 --deployment
remote:        Your Gemfile lists the gem pg (>= 0) more than once.
remote:        You should probably keep only one of them.
remote:        Remove any duplicate entries and specify the gem only once (per group).
remote:        While it's not a problem now, it could cause errors if you change the version of one of them later.
remote:        The dependency tzinfo-data (>= 0) will be unused by any of the platforms Bundler is installing for. Bundler is installing for ruby but the dependency is only for x86-mingw32, x86-mswin32, x64-mingw32, java. To add those platforms to the bundle, run `bundle lock --add-platform x86-mingw32 x86-mswin32 x64-mingw32 java`.
remote:        Fetching gem metadata from https://rubygems.org/............
remote:        Fetching rake 13.0.3
remote:        Installing rake 13.0.3
remote:        Fetching concurrent-ruby 1.1.8
remote:        Fetching minitest 5.14.4
remote:        Fetching zeitwerk 2.4.2
remote:        Installing zeitwerk 2.4.2
remote:        Installing minitest 5.14.4
remote:        Installing concurrent-ruby 1.1.8
remote:        Fetching builder 3.2.4
remote:        Installing builder 3.2.4
remote:        Fetching erubi 1.10.0
remote:        Installing erubi 1.10.0
remote:        Fetching mini_portile2 2.5.0
remote:        Fetching racc 1.5.2
remote:        Installing mini_portile2 2.5.0
remote:        Installing racc 1.5.2 with native extensions
remote:        Fetching crass 1.0.6
remote:        Installing crass 1.0.6
remote:        Fetching rack 2.2.3
remote:        Installing rack 2.2.3
remote:        Fetching nio4r 2.5.5
remote:        Installing nio4r 2.5.5 with native extensions
remote:        Fetching websocket-extensions 0.1.5
remote:        Installing websocket-extensions 0.1.5
remote:        Fetching mimemagic 0.3.5
remote:        Installing mimemagic 0.3.5
remote:        Fetching mini_mime 1.0.2
remote:        Installing mini_mime 1.0.2
remote:        Fetching bcrypt 3.1.16
remote:        Installing bcrypt 3.1.16 with native extensions
remote:        Fetching msgpack 1.4.2
remote:        Installing msgpack 1.4.2 with native extensions
remote:        Using bundler 1.17.3
remote:        Fetching cancan 1.6.10
remote:        Installing cancan 1.6.10
remote:        Fetching method_source 1.0.0
remote:        Installing method_source 1.0.0
remote:        Fetching thor 1.1.0
remote:        Installing thor 1.1.0
remote:        Fetching ffi 1.14.2
remote:        Installing ffi 1.14.2 with native extensions
remote:        Fetching pg 1.2.3
remote:        Installing pg 1.2.3 with native extensions
remote:        Fetching tilt 2.0.10
remote:        Installing tilt 2.0.10
remote:        Fetching semantic_range 2.3.1
remote:        Installing semantic_range 2.3.1
remote:        Fetching turbolinks-source 5.2.0
remote:        Installing turbolinks-source 5.2.0
remote:        Fetching i18n 1.8.9
remote:        Installing i18n 1.8.9
remote:        Fetching tzinfo 2.0.4
remote:        Installing tzinfo 2.0.4
remote:        Fetching rack-test 1.1.0
remote:        Installing rack-test 1.1.0
remote:        Fetching sprockets 4.0.2
remote:        Installing sprockets 4.0.2
remote:        Fetching rack-proxy 0.6.5
remote:        Installing rack-proxy 0.6.5
remote:        Fetching websocket-driver 0.7.3
remote:        Installing websocket-driver 0.7.3 with native extensions
remote:        Fetching marcel 0.3.3
remote:        Installing marcel 0.3.3
remote:        Fetching mail 2.7.1
remote:        Installing mail 2.7.1
remote:        Fetching nokogiri 1.11.1 (x86_64-linux)
remote:        Installing nokogiri 1.11.1 (x86_64-linux)
remote:        Fetching puma 5.2.1
remote:        Installing puma 5.2.1 with native extensions
remote:        Fetching figaro 1.2.0
remote:        Installing figaro 1.2.0
remote:        Fetching bootsnap 1.7.2
remote:        Installing bootsnap 1.7.2 with native extensions
remote:        Fetching turbolinks 5.2.1
remote:        Installing turbolinks 5.2.1
remote:        Fetching activesupport 6.1.3
remote:        Installing activesupport 6.1.3
remote:        Fetching sassc 2.4.0
remote:        Installing sassc 2.4.0 with native extensions
remote:        Fetching loofah 2.9.0
remote:        Installing loofah 2.9.0
remote:        Fetching rails-dom-testing 2.0.3
remote:        Installing rails-dom-testing 2.0.3
remote:        Fetching globalid 0.4.2
remote:        Installing globalid 0.4.2
remote:        Fetching activemodel 6.1.3
remote:        Installing activemodel 6.1.3
remote:        Fetching jbuilder 2.11.2
remote:        Installing jbuilder 2.11.2
remote:        Fetching rails-html-sanitizer 1.3.0
remote:        Installing rails-html-sanitizer 1.3.0
remote:        Fetching activejob 6.1.3
remote:        Installing activejob 6.1.3
remote:        Fetching activerecord 6.1.3
remote:        Installing activerecord 6.1.3
remote:        Fetching email_validator 1.6.0
remote:        Installing email_validator 1.6.0
remote:        Fetching actionview 6.1.3
remote:        Installing actionview 6.1.3
remote:        Fetching actionpack 6.1.3
remote:        Installing actionpack 6.1.3
remote:        Fetching activestorage 6.1.3
remote:        Fetching actioncable 6.1.3
remote:        Installing activestorage 6.1.3
remote:        Installing actioncable 6.1.3
remote:        Fetching actionmailer 6.1.3
remote:        Installing actionmailer 6.1.3
remote:        Fetching railties 6.1.3
remote:        Installing railties 6.1.3
remote:        Fetching sprockets-rails 3.2.2
remote:        Installing sprockets-rails 3.2.2
remote:        Fetching actionmailbox 6.1.3
remote:        Installing actionmailbox 6.1.3
remote:        Fetching actiontext 6.1.3
remote:        Installing actiontext 6.1.3
remote:        Fetching rails 6.1.3
remote:        Fetching webpacker 5.2.1
remote:        Installing rails 6.1.3
remote:        Installing webpacker 5.2.1
remote:        Fetching clearance 1.15.1
remote:        Installing clearance 1.15.1
remote:        Fetching sassc-rails 2.1.2
remote:        Installing sassc-rails 2.1.2
remote:        Fetching sass-rails 6.0.0
remote:        Installing sass-rails 6.0.0
remote:        Bundle complete! 27 Gemfile dependencies, 63 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 (260.60s)
remote:        Cleaning up the bundler cache.
remote:        Your Gemfile lists the gem pg (>= 0) more than once.
remote:        You should probably keep only one of them.
remote:        Remove any duplicate entries and specify the gem only once (per group).
remote:        While it's not a problem now, it could cause errors if you change the version of one of them later.
remote:        The dependency tzinfo-data (>= 0) will be unused by any of the platforms Bundler is installing for. Bundler is installing for ruby but the dependency is only for x86-mingw32, x86-mswin32, x64-mingw32, java. To add those platforms to the bundle, run `bundle lock --add-platform x86-mingw32 x86-mswin32 x64-mingw32 java`.
remote: -----> Installing node-v10.15.3-linux-x64
remote: -----> Installing yarn-v1.16.0
remote: -----> Detecting rake tasks
remote: -----> Preparing app for Rails asset pipeline
remote:        Running: rake assets:precompile
remote:        yarn install v1.16.0
remote:        [1/4] Resolving packages...
remote:        [2/4] Fetching packages...
remote:        error @rails/webpacker@5.2.1: The engine "node" is incompatible with this module. Expected version ">=10.17.0". Got "10.15.3"
remote:        error Found incompatible module.
remote:        info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.
remote:        rake aborted!
remote:        Sprockets::FileNotFound: couldn't find file 'trix/dist/trix' with type 'text/css'
remote:        Checked in these paths: 
remote:          /tmp/build_8fc01f26/app/assets/config
remote:          /tmp/build_8fc01f26/app/assets/images
remote:          /tmp/build_8fc01f26/app/assets/stylesheets
remote:          /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/actioncable-6.1.3/app/assets/javascripts
remote:          /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/activestorage-6.1.3/app/assets/javascripts
remote:          /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/actionview-6.1.3/lib/assets/compiled
remote:          /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/turbolinks-source-5.2.0/lib/assets/javascripts
remote:          /tmp/build_8fc01f26/node_modules
remote:        /tmp/build_8fc01f26/app/assets/stylesheets/actiontext.scss:6
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/resolve.rb:62:in `resolve!'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/directive_processor.rb:409:in `resolve'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/directive_processor.rb:216:in `process_require_directive'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/directive_processor.rb:189:in `block in process_directives'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/directive_processor.rb:187:in `each'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/directive_processor.rb:187:in `process_directives'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/directive_processor.rb:84:in `_call'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/directive_processor.rb:65:in `call'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/processor_utils.rb:84:in `call_processor'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/processor_utils.rb:66:in `block in call_processors'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/processor_utils.rb:65:in `reverse_each'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/processor_utils.rb:65:in `call_processors'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/loader.rb:182:in `load_from_unloaded'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/loader.rb:59:in `block in load'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/loader.rb:337:in `fetch_asset_from_dependency_cache'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/loader.rb:43:in `load'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/cached_environment.rb:44:in `load'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/bundle.rb:27:in `call'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/processor_utils.rb:84:in `call_processor'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/processor_utils.rb:66:in `block in call_processors'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/processor_utils.rb:65:in `reverse_each'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/processor_utils.rb:65:in `call_processors'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/loader.rb:182:in `load_from_unloaded'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/loader.rb:59:in `block in load'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/loader.rb:337:in `fetch_asset_from_dependency_cache'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/loader.rb:43:in `load'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/cached_environment.rb:44:in `load'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/bundle.rb:32:in `block in call'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/bundle.rb:31:in `call'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/processor_utils.rb:84:in `call_processor'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/processor_utils.rb:66:in `block in call_processors'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/processor_utils.rb:65:in `reverse_each'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/processor_utils.rb:65:in `call_processors'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/loader.rb:182:in `load_from_unloaded'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/loader.rb:59:in `block in load'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/loader.rb:337:in `fetch_asset_from_dependency_cache'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/loader.rb:43:in `load'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/cached_environment.rb:44:in `load'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/base.rb:81:in `find_asset'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/base.rb:88:in `find_all_linked_assets'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.2/lib/sprockets/manifest.rb:125:in `block (2 levels) in find'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/concurrent-ruby-1.1.8/lib/concurrent-ruby/concurrent/executor/safe_task_executor.rb:24:in `block in execute'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/concurrent-ruby-1.1.8/lib/concurrent-ruby/concurrent/synchronization/mutex_lockable_object.rb:41:in `block in synchronize'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/concurrent-ruby-1.1.8/lib/concurrent-ruby/concurrent/synchronization/mutex_lockable_object.rb:41:in `synchronize'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/concurrent-ruby-1.1.8/lib/concurrent-ruby/concurrent/synchronization/mutex_lockable_object.rb:41:in `synchronize'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/concurrent-ruby-1.1.8/lib/concurrent-ruby/concurrent/executor/safe_task_executor.rb:19:in `execute'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/concurrent-ruby-1.1.8/lib/concurrent-ruby/concurrent/promise.rb:563:in `block in realize'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/concurrent-ruby-1.1.8/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:363:in `run_task'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/concurrent-ruby-1.1.8/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:352:in `block (3 levels) in create_worker'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/concurrent-ruby-1.1.8/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:335:in `loop'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/concurrent-ruby-1.1.8/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:335:in `block (2 levels) in create_worker'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/concurrent-ruby-1.1.8/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:334:in `catch'
remote:        /tmp/build_8fc01f26/vendor/bundle/ruby/2.6.0/gems/concurrent-ruby-1.1.8/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:334:in `block in create_worker'
remote:        Tasks: TOP => assets:precompile
remote:        (See full trace by running task with --trace)
remote: 
remote:  !
remote:  !     Precompiling assets failed.
remote:  !
remote:  !     Push rejected, failed to compile Ruby app.
remote: 
remote:  !     Push failed
remote:  !
remote:  ! ## Warning - The same version of this code has already been built: 85e3e5a7b8fe7283987f26d235ba4fb37c08cd70
remote:  !
remote:  ! We have detected that you have triggered a build from source code with version 85e3e5a7b8fe7283987f26d235ba4fb37c08cd70
remote:  ! at least twice. One common cause of this behavior is attempting to deploy code from a different branch.
remote:  !
remote:  ! If you are developing on a branch and deploying via git you must run:
remote:  !
remote:  !     git push heroku <branchname>:main
remote:  !
remote:  ! This article goes into details on the behavior:
remote:  !   https://devcenter.heroku.com/articles/duplicate-build-version
remote: 
remote: Verifying deploy...
remote: 
remote: !       Push rejected to nameless-bastion-29082.
remote: 
To https://git.heroku.com/nameless-bastion-29082.git
 ! [remote rejected]   main -> main (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/nameless-bastion-29082.git'

2. Things I have tried (that did not work)

heroku buildpacks:clear
heroku buildpacks:set heroku/nodejs
heroku buildpacks:add heroku/ruby

yarn install -ignore--engines

I am a student who is still learning ruby/rails. I would appreciate any and all help, thank you so much!

Answer 1

If you scroll down the deploy errors from Heroku it says.. (In development you're going to have to read a lot of errors so get used to searching up terms and getting a complete understanding of what the errors are saying)

So it says

Running bundle install..
Your Gemfile lists the gem pg.. more than once.

So your Gemfile file is composed of the things that are used to install modules/gems when your app runs.

You accidentally listed one of the modules twice (pg/postgres) just remove one of them and it should work.

Answer 2

It also says

@rails/webpacker@5.2.1: The engine "node" is incompatible. 

Expected version ">=10.17.0". Got "10.15.3"

Found incompatible module.

So try to change the webpack/webpacker version in Gemfile as well.