title: LoadError: Error loading the 'sqlite3' Active Record adapter
body: <p>I have successfully pushed my repository from my local computer to heroku after several tries in <a href="https://stackoverflow.com/questions/54373480/heroku-cannot-push-to-heroku-due-to-nomethoderror">here</a> and also following <a href="https://devcenter.heroku.com/articles/getting-started-with-rails5#heroku-gems" rel="nofollow noreferrer">this</a>. However, clicking on both the <a href="https://git.heroku.com/arcane-depths-69465.git" rel="nofollow noreferrer">git</a> and <a href="https://arcane-depths-69465.herokuapp.com" rel="nofollow noreferrer">herokuapp.com link</a> produces error messages. Though the push has many warnings, I tried migrating my database anyway. May I know what is the problem here? Please inform me if more information is required to solve the problem. Thanks a lot in advance.</p>
  
  <p>Gemfile</p>
  
  <pre><code>source 'https://rubygems.org'
  source 'https://rails-assets.org' do
    gem 'rails-assets-tether', '&gt;= 1.3.3'
    gem 'rails-assets-chosen'
  end
  
  ruby '2.5.1'
  
  gem 'rails',        '5.2.2'
  gem 'bcrypt',           '3.1.11'
  gem 'will_paginate',           '3.1.6'
  gem 'bootstrap-will_paginate', '1.0.0'
  gem 'faker',    '1.7.3'
  gem 'bootstrap-sass',   '3.3.7'
  gem 'puma',           '3.9.1'
  gem 'sass-rails',     '5.0.6'
  gem 'uglifier',       '3.2.0'
  gem 'coffee-rails',   '4.2.2'
  gem 'jquery-rails',   '4.3.1'
  gem 'turbolinks',     '5.0.1'
  gem 'jbuilder',       '2.7.0'
  gem 'popper_js', '~&gt; 1.11.1'
  gem 'bootstrap', '4.0.0.alpha6'
  gem 'simple_form'
  
  
  
  
  
  group :development, :test do
    gem 'sqlite3'
    gem 'byebug',  '9.0.6', platform: :mri
  end
  
  group :production do
    gem 'pg'
  end
  
  
  
  group :development do
    gem 'web-console',           '3.5.1'
    gem 'listen',                '3.1.5'
    gem 'spring',                '2.0.2'
    gem 'spring-watcher-listen', '2.0.1'
  end
  
  group :test do
    gem 'rails-controller-testing', '1.0.2'
    gem 'minitest',                 '5.10.3'
    gem 'minitest-reporters',       '1.1.14'
    gem 'guard',                    '2.13.0'
    gem 'guard-minitest',           '2.4.4'
  end
  
  
  
  
  # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
  gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
  </code></pre>
  
  <p>config/database.yml</p>
  
  <pre><code># SQLite version 3.x
  #   gem install sqlite3
  #
  #   Ensure the SQLite 3 gem is defined in your Gemfile
  #   gem 'sqlite3'
  #
  default: &amp;default
    adapter: sqlite3
    #adapter: postgresql
    pool: &lt;%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %&gt;
    timeout: 5000
  
  development:
    &lt;&lt;: *default
    database: db/development.sqlite3
  
  # Warning: The database defined as "test" will be erased and
  # re-generated from your development database when you run "rake".
  # Do not set this db to the same as development or production.
  test:
    &lt;&lt;: *default
    database: db/test.sqlite3
  
  production:
    &lt;&lt;: *default
    database: db/production.sqlite3
  </code></pre>
  
  <p>Output when I run <code>git push heroku master</code></p>
  
  <pre><code>Enumerating objects: 7, done.
  Counting objects: 100% (7/7), done.
  Delta compression using up to 8 threads
  Compressing objects: 100% (4/4), done.
  Writing objects: 100% (4/4), 441 bytes | 441.00 KiB/s, done.
  Total 4 (delta 3), reused 0 (delta 0)
  remote: Compressing source files... done.
  remote: Building source:
  remote: 
  remote: -----&gt; Ruby app detected
  remote: -----&gt; Compiling Ruby/Rails
  remote: -----&gt; Using Ruby version: ruby-2.5.1
  remote: -----&gt; Installing dependencies using bundler 1.15.2
  remote:        Ruby version change detected. Clearing bundler cache.
  remote:        Old: ruby 2.5.3p105 (2018-10-18 revision 65156) [x86_64-linux]
  remote:        New: ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux]
  remote:        Running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin -j4 --deployment
  remote:        Warning: the running version of Bundler (1.15.2) is older than the version that created the lockfile (1.17.3). We suggest you upgrade to the latest version of Bundler by running `gem install bundler`.
  remote:        Fetching gem metadata from https://rails-assets.org/...
  remote:        Fetching gem metadata from https://rubygems.org/.........
  remote:        Fetching version metadata from https://rails-assets.org/..
  remote:        Fetching version metadata from https://rubygems.org/..
  remote:        Fetching dependency metadata from https://rails-assets.org/..
  remote:        Fetching dependency metadata from https://rubygems.org/.
  remote:        Fetching gem metadata from https://rails-assets.org/...
  remote:        Fetching version metadata from https://rails-assets.org/..
  remote:        Fetching rake 12.3.2
  remote:        Fetching concurrent-ruby 1.1.4
  remote:        Fetching minitest 5.10.3
  remote:        Installing minitest 5.10.3
  remote:        Installing rake 12.3.2
  remote:        Installing concurrent-ruby 1.1.4
  remote:        Fetching thread_safe 0.3.6
  remote:        Installing thread_safe 0.3.6
  remote:        Fetching builder 3.2.3
  remote:        Installing builder 3.2.3
  remote:        Fetching erubi 1.8.0
  remote:        Installing erubi 1.8.0
  remote:        Fetching mini_portile2 2.4.0
  remote:        Fetching crass 1.0.4
  remote:        Installing mini_portile2 2.4.0
  remote:        Installing crass 1.0.4
  remote:        Fetching rack 2.0.6
  remote:        Installing rack 2.0.6
  remote:        Fetching nio4r 2.3.1
  remote:        Installing nio4r 2.3.1 with native extensions
  remote:        Fetching websocket-extensions 0.1.3
  remote:        Installing websocket-extensions 0.1.3
  remote:        Fetching mini_mime 1.0.1
  remote:        Installing mini_mime 1.0.1
  remote:        Fetching arel 9.0.0
  remote:        Installing arel 9.0.0
  remote:        Fetching mimemagic 0.3.3
  remote:        Installing mimemagic 0.3.3
  remote:        Fetching execjs 2.7.0
  remote:        Installing execjs 2.7.0
  remote:        Fetching bcrypt 3.1.11
  remote:        Fetching rb-fsevent 0.10.3
  remote:        Installing bcrypt 3.1.11 with native extensions
  remote:        Installing rb-fsevent 0.10.3
  remote:        Fetching ffi 1.10.0
  remote:        Installing ffi 1.10.0 with native extensions
  remote:        Fetching will_paginate 3.1.6
  remote:        Installing will_paginate 3.1.6
  remote:        Using bundler 1.15.2
  remote:        Fetching coffee-script-source 1.12.2
  remote:        Installing coffee-script-source 1.12.2
  remote:        Fetching method_source 0.9.2
  remote:        Installing method_source 0.9.2
  remote:        Fetching thor 0.20.3
  remote:        Installing thor 0.20.3
  remote:        Fetching multi_json 1.13.1
  remote:        Installing multi_json 1.13.1
  remote:        Fetching pg 0.18.4
  remote:        Installing pg 0.18.4 with native extensions
  remote:        Fetching popper_js 1.11.1
  remote:        Installing popper_js 1.11.1
  remote:        Fetching puma 3.9.1
  remote:        Installing puma 3.9.1 with native extensions
  remote:        Fetching rails-assets-chosen 1.8.7
  remote:        Installing rails-assets-chosen 1.8.7
  remote:        Fetching rails-assets-tether 1.4.3
  remote:        Installing rails-assets-tether 1.4.3
  remote:        Fetching tilt 2.0.9
  remote:        Installing tilt 2.0.9
  remote:        Fetching turbolinks-source 5.2.0
  remote:        Installing turbolinks-source 5.2.0
  remote:        Fetching tzinfo 1.2.5
  remote:        Installing tzinfo 1.2.5
  remote:        Fetching nokogiri 1.10.1
  remote:        Installing nokogiri 1.10.1 with native extensions
  remote:        Fetching i18n 0.9.5
  remote:        Installing i18n 0.9.5
  remote:        Fetching websocket-driver 0.7.0
  remote:        Installing websocket-driver 0.7.0 with native extensions
  remote:        Fetching mail 2.7.1
  remote:        Installing mail 2.7.1
  remote:        Fetching rack-test 1.1.0
  remote:        Installing rack-test 1.1.0
  remote:        Fetching sprockets 3.7.2
  remote:        Installing sprockets 3.7.2
  remote:        Fetching autoprefixer-rails 9.4.6
  remote:        Installing autoprefixer-rails 9.4.6
  remote:        Fetching uglifier 3.2.0
  remote:        Installing uglifier 3.2.0
  remote:        Fetching marcel 0.3.3
  remote:        Installing marcel 0.3.3
  remote:        Fetching bootstrap-will_paginate 1.0.0
  remote:        Installing bootstrap-will_paginate 1.0.0
  remote:        Fetching coffee-script 2.4.1
  remote:        Installing coffee-script 2.4.1
  remote:        Fetching rb-inotify 0.10.0
  remote:        Installing rb-inotify 0.10.0
  remote:        Fetching turbolinks 5.0.1
  remote:        Installing turbolinks 5.0.1
  remote:        Fetching activesupport 5.2.2
  remote:        Installing activesupport 5.2.2
  remote:        Fetching faker 1.7.3
  remote:        Installing faker 1.7.3
  remote:        Fetching sass-listen 4.0.0
  remote:        Installing sass-listen 4.0.0
  remote:        Fetching globalid 0.4.2
  remote:        Installing globalid 0.4.2
  remote:        Fetching activemodel 5.2.2
  remote:        Installing activemodel 5.2.2
  remote:        Fetching jbuilder 2.7.0
  remote:        Installing jbuilder 2.7.0
  remote:        Fetching sass 3.7.3
  remote:        Installing sass 3.7.3
  remote:        Fetching activejob 5.2.2
  remote:        Installing activejob 5.2.2
  remote:        Fetching activerecord 5.2.2
  remote:        Installing activerecord 5.2.2
  remote:        Fetching bootstrap 4.0.0.alpha6
  remote:        Installing bootstrap 4.0.0.alpha6
  remote:        Fetching bootstrap-sass 3.3.7
  remote:        Installing bootstrap-sass 3.3.7
  remote:        Fetching rails-dom-testing 2.0.3
  remote:        Fetching loofah 2.2.3
  remote:        Installing rails-dom-testing 2.0.3
  remote:        Installing loofah 2.2.3
  remote:        Fetching rails-html-sanitizer 1.0.4
  remote:        Installing rails-html-sanitizer 1.0.4
  remote:        Fetching actionview 5.2.2
  remote:        Installing actionview 5.2.2
  remote:        Fetching actionpack 5.2.2
  remote:        Installing actionpack 5.2.2
  remote:        Fetching actionmailer 5.2.2
  remote:        Fetching actioncable 5.2.2
  remote:        Fetching activestorage 5.2.2
  remote:        Installing actioncable 5.2.2
  remote:        Installing actionmailer 5.2.2
  remote:        Installing activestorage 5.2.2
  remote:        Fetching railties 5.2.2
  remote:        Installing railties 5.2.2
  remote:        Fetching sprockets-rails 3.2.1
  remote:        Installing sprockets-rails 3.2.1
  remote:        Fetching simple_form 4.1.0
  remote:        Installing simple_form 4.1.0
  remote:        Fetching jquery-rails 4.3.1
  remote:        Fetching coffee-rails 4.2.2
  remote:        Fetching rails 5.2.2
  remote:        Installing rails 5.2.2
  remote:        Installing coffee-rails 4.2.2
  remote:        Fetching sass-rails 5.0.6
  remote:        Installing sass-rails 5.0.6
  remote:        Installing jquery-rails 4.3.1
  remote:        Bundle complete! 31 Gemfile dependencies, 71 gems now installed.
  remote:        Gems in the groups development and test were not installed.
  remote:        Bundled gems are installed into ./vendor/bundle.
  remote:        Post-install message from sass:
  remote:        
  remote:        Ruby Sass is deprecated and will be unmaintained as of 26 March 2019.
  remote:        
  remote:        * If you use Sass as a command-line tool, we recommend using Dart Sass, the new
  remote:          primary implementation: https://sass-lang.com/install
  remote:        
  remote:        * If you use Sass as a plug-in for a Ruby web framework, we recommend using the
  remote:          sassc gem: https://github.com/sass/sassc-ruby#readme
  remote:        
  remote:        * For more details, please refer to the Sass blog:
  remote:          http://sass.logdown.com/posts/7081811
  remote:        
  remote:        Bundle completed (48.73s)
  remote:        Cleaning up the bundler cache.
  remote:        Warning: the running version of Bundler (1.15.2) is older than the version that created the lockfile (1.17.3). We suggest you upgrade to the latest version of Bundler by running `gem install bundler`.
  remote:        The latest bundler is 2.0.1, but you are currently running 1.15.2.
  remote:        To update, run `gem install bundler`
  remote: -----&gt; Installing node-v10.14.1-linux-x64
  remote: -----&gt; Detecting rake tasks
  remote: -----&gt; Preparing app for Rails asset pipeline
  remote:        Running: rake assets:precompile
  remote:        /tmp/build_21f3a603c9f764cf4e2758843744dd99/vendor/bundle/ruby/2.5.0/gems/bootstrap-4.0.0.alpha6/lib/bootstrap/version.rb:2: warning: already initialized constant Bootstrap::VERSION
  remote:        /tmp/build_21f3a603c9f764cf4e2758843744dd99/vendor/bundle/ruby/2.5.0/gems/bootstrap-sass-3.3.7/lib/bootstrap-sass/version.rb:2: warning: previous definition of VERSION was here
  remote:        /tmp/build_21f3a603c9f764cf4e2758843744dd99/vendor/bundle/ruby/2.5.0/gems/bootstrap-4.0.0.alpha6/lib/bootstrap/version.rb:3: warning: already initialized constant Bootstrap::BOOTSTRAP_SHA
  remote:        /tmp/build_21f3a603c9f764cf4e2758843744dd99/vendor/bundle/ruby/2.5.0/gems/bootstrap-sass-3.3.7/lib/bootstrap-sass/version.rb:3: warning: previous definition of BOOTSTRAP_SHA was here
  remote:        Yarn executable was not detected in the system.
  remote:        Download Yarn at https://yarnpkg.com/en/docs/install
  remote:        Asset precompilation completed (2.15s)
  remote:        Cleaning assets
  remote:        Running: rake assets:clean
  remote:        /tmp/build_21f3a603c9f764cf4e2758843744dd99/vendor/bundle/ruby/2.5.0/gems/bootstrap-4.0.0.alpha6/lib/bootstrap/version.rb:2: warning: already initialized constant Bootstrap::VERSION
  remote:        /tmp/build_21f3a603c9f764cf4e2758843744dd99/vendor/bundle/ruby/2.5.0/gems/bootstrap-sass-3.3.7/lib/bootstrap-sass/version.rb:2: warning: previous definition of VERSION was here
  remote:        /tmp/build_21f3a603c9f764cf4e2758843744dd99/vendor/bundle/ruby/2.5.0/gems/bootstrap-4.0.0.alpha6/lib/bootstrap/version.rb:3: warning: already initialized constant Bootstrap::BOOTSTRAP_SHA
  remote:        /tmp/build_21f3a603c9f764cf4e2758843744dd99/vendor/bundle/ruby/2.5.0/gems/bootstrap-sass-3.3.7/lib/bootstrap-sass/version.rb:3: warning: previous definition of BOOTSTRAP_SHA was here
  remote: -----&gt; Detecting rails configuration
  remote: 
  remote: ###### WARNING:
  remote: 
  remote:        Detecting rails configuration failed
  remote:        set HEROKU_DEBUG_RAILS_RUNNER=1 to debug
  remote: 
  remote: 
  remote: -----&gt; Discovering process types
  remote:        Procfile declares types     -&gt; web
  remote:        Default types for buildpack -&gt; console, rake
  remote: 
  remote: -----&gt; Compressing...
  remote:        Done: 49M
  remote: -----&gt; Launching...
  remote:        Released v6
  remote:        https://arcane-depths-69465.herokuapp.com/ deployed to Heroku
  remote: 
  remote: Verifying deploy... done.
  To https://git.heroku.com/arcane-depths-69465.git
     4eb67f4..70f8752  master -&gt; master
  </code></pre>
  
  <p>Running <code>heroku run rake db:migrate</code></p>
  
  <pre><code>/app/vendor/bundle/ruby/2.5.0/gems/bootstrap-4.0.0.alpha6/lib/bootstrap/version.rb:2: warning: already initialized constant Bootstrap::VERSION
  /app/vendor/bundle/ruby/2.5.0/gems/bootstrap-sass-3.3.7/lib/bootstrap-sass/version.rb:2: warning: previous definition of VERSION was here
  /app/vendor/bundle/ruby/2.5.0/gems/bootstrap-4.0.0.alpha6/lib/bootstrap/version.rb:3: warning: already initialized constant Bootstrap::BOOTSTRAP_SHA
  /app/vendor/bundle/ruby/2.5.0/gems/bootstrap-sass-3.3.7/lib/bootstrap-sass/version.rb:3: warning: previous definition of BOOTSTRAP_SHA was here
  rake aborted!
  LoadError: Error loading the 'sqlite3' Active Record adapter. Missing a gem it depends on? sqlite3 is not part of the bundle. Add it to your Gemfile.
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/rubygems_integration.rb:377:in `block (2 levels) in replace_gem'
  /app/vendor/bundle/ruby/2.5.0/gems/activerecord-5.2.2/lib/active_record/connection_adapters/sqlite3_adapter.rb:12:in `&lt;top (required)&gt;'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:291:in `require'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:291:in `block in require'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:257:in `load_dependency'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:291:in `require'
  /app/vendor/bundle/ruby/2.5.0/gems/activerecord-5.2.2/lib/active_record/connection_adapters/connection_specification.rb:191:in `spec'
  /app/vendor/bundle/ruby/2.5.0/gems/activerecord-5.2.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:952:in `establish_connection'
  /app/vendor/bundle/ruby/2.5.0/gems/activerecord-5.2.2/lib/active_record/connection_handling.rb:60:in `establish_connection'
  /app/vendor/bundle/ruby/2.5.0/gems/activerecord-5.2.2/lib/active_record/railtie.rb:136:in `block (2 levels) in &lt;class:Railtie&gt;'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/lazy_load_hooks.rb:71:in `instance_eval'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/lazy_load_hooks.rb:71:in `block in execute_hook'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/lazy_load_hooks.rb:62:in `with_execution_control'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/lazy_load_hooks.rb:67:in `execute_hook'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/lazy_load_hooks.rb:52:in `block in run_load_hooks'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/lazy_load_hooks.rb:51:in `each'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/lazy_load_hooks.rb:51:in `run_load_hooks'
  /app/vendor/bundle/ruby/2.5.0/gems/activerecord-5.2.2/lib/active_record/base.rb:328:in `&lt;module:ActiveRecord&gt;'
  /app/vendor/bundle/ruby/2.5.0/gems/activerecord-5.2.2/lib/active_record/base.rb:27:in `&lt;top (required)&gt;'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:291:in `require'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:291:in `block in require'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:257:in `load_dependency'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:291:in `require'
  /app/vendor/bundle/ruby/2.5.0/gems/activerecord-5.2.2/lib/active_record/railties/databases.rake:17:in `block (2 levels) in &lt;top (required)&gt;'
  /app/vendor/bundle/ruby/2.5.0/gems/rake-12.3.2/exe/rake:27:in `&lt;top (required)&gt;'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/cli/exec.rb:74:in `load'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/cli/exec.rb:74:in `kernel_load'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/cli/exec.rb:27:in `run'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/cli.rb:360:in `exec'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/vendor/thor/lib/thor.rb:369:in `dispatch'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/cli.rb:20:in `dispatch'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/vendor/thor/lib/thor/base.rb:444:in `start'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/cli.rb:10:in `start'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/exe/bundle:30:in `block in &lt;top (required)&gt;'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/friendly_errors.rb:121:in `with_friendly_errors'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/exe/bundle:22:in `&lt;top (required)&gt;'
  /app/bin/bundle:3:in `load'
  /app/bin/bundle:3:in `&lt;main&gt;'
  
  Caused by:
  Gem::LoadError: sqlite3 is not part of the bundle. Add it to your Gemfile.
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/rubygems_integration.rb:377:in `block (2 levels) in replace_gem'
  /app/vendor/bundle/ruby/2.5.0/gems/activerecord-5.2.2/lib/active_record/connection_adapters/sqlite3_adapter.rb:12:in `&lt;top (required)&gt;'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:291:in `require'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:291:in `block in require'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:257:in `load_dependency'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:291:in `require'
  /app/vendor/bundle/ruby/2.5.0/gems/activerecord-5.2.2/lib/active_record/connection_adapters/connection_specification.rb:191:in `spec'
  /app/vendor/bundle/ruby/2.5.0/gems/activerecord-5.2.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:952:in `establish_connection'
  /app/vendor/bundle/ruby/2.5.0/gems/activerecord-5.2.2/lib/active_record/connection_handling.rb:60:in `establish_connection'
  /app/vendor/bundle/ruby/2.5.0/gems/activerecord-5.2.2/lib/active_record/railtie.rb:136:in `block (2 levels) in &lt;class:Railtie&gt;'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/lazy_load_hooks.rb:71:in `instance_eval'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/lazy_load_hooks.rb:71:in `block in execute_hook'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/lazy_load_hooks.rb:62:in `with_execution_control'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/lazy_load_hooks.rb:67:in `execute_hook'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/lazy_load_hooks.rb:52:in `block in run_load_hooks'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/lazy_load_hooks.rb:51:in `each'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/lazy_load_hooks.rb:51:in `run_load_hooks'
  /app/vendor/bundle/ruby/2.5.0/gems/activerecord-5.2.2/lib/active_record/base.rb:328:in `&lt;module:ActiveRecord&gt;'
  /app/vendor/bundle/ruby/2.5.0/gems/activerecord-5.2.2/lib/active_record/base.rb:27:in `&lt;top (required)&gt;'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:291:in `require'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:291:in `block in require'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:257:in `load_dependency'
  /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:291:in `require'
  /app/vendor/bundle/ruby/2.5.0/gems/activerecord-5.2.2/lib/active_record/railties/databases.rake:17:in `block (2 levels) in &lt;top (required)&gt;'
  /app/vendor/bundle/ruby/2.5.0/gems/rake-12.3.2/exe/rake:27:in `&lt;top (required)&gt;'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/cli/exec.rb:74:in `load'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/cli/exec.rb:74:in `kernel_load'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/cli/exec.rb:27:in `run'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/cli.rb:360:in `exec'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/vendor/thor/lib/thor.rb:369:in `dispatch'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/cli.rb:20:in `dispatch'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/vendor/thor/lib/thor/base.rb:444:in `start'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/cli.rb:10:in `start'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/exe/bundle:30:in `block in &lt;top (required)&gt;'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/friendly_errors.rb:121:in `with_friendly_errors'
  /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/exe/bundle:22:in `&lt;top (required)&gt;'
  /app/bin/bundle:3:in `load'
  /app/bin/bundle:3:in `&lt;main&gt;'
  Tasks: TOP =&gt; db:migrate =&gt; db:load_config
  (See full trace by running task with --trace)
  </code></pre>