Precompiling assets failed がわかりません

Question

前提・実現したいこと

本番環境にデプロイしたい。

ここに質問の内容を詳しく書いてください。
Herokuにデプロイを考えております。
最初はデプロイできましたが、再度追加実装を行った後、デプロイができなくなりました。

発生している問題・エラーメッセージ

remote:  !
remote:  !     Precompiling assets failed.
remote:  !
remote:  !     Push rejected, failed to compile Ruby app.
remote: 
remote:  !     Push failed
remote: Verifying deploy...
remote: 
remote: !       Push rejected to アプリ名.
remote: 
To https://git.heroku.com/アプリ名.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/アプリ名.git'

該当のソースコード

 % git push heroku master
Enumerating objects: 143, done.
Counting objects: 100% (143/143), done.
Delta compression using up to 4 threads
Compressing objects: 100% (92/92), done.
Writing objects: 100% (95/95), 112.45 KiB | 4.16 MiB/s, done.
Total 95 (delta 67), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote: 
remote: -----> Ruby app detected
remote: -----> Installing bundler 2.1.4
remote: -----> Removing BUNDLED WITH version in the Gemfile.lock
remote: -----> Compiling Ruby/Rails
remote: -----> Using Ruby version: ruby-2.6.5
remote: -----> Installing dependencies using bundler 2.1.4
remote:        Running: BUNDLE_WITHOUT='development:test' BUNDLE_PATH=vendor/bundle BUNDLE_BIN=vendor/bundle/bin BUNDLE_DEPLOYMENT=1 bundle install -j4
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:        Using rake 13.0.1
　　　　〜〜一部省略〜〜
emote:  !
remote:  !     Precompiling assets failed.
remote:  !
remote:  !     Push rejected, failed to compile Ruby app.
remote: 
remote:  !     Push failed
remote: Verifying deploy...
remote: 
remote: !       Push rejected to アプリ名.
remote: 
To https://git.heroku.com/アプリ名.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/アプリ名.git'

production.rbのソースコード

Rails.application.configure do
  # Settings specified here will take precedence over those in config/application.rb.

  # Code is not reloaded between requests.
  config.cache_classes = true

  # Eager load code on boot. This eager loads most of Rails and
  # your application in memory, allowing both threaded web servers
  # and those relying on copy on write to perform better.
  # Rake tasks automatically ignore this option for performance.
  config.eager_load = true

  # Full error reports are disabled and caching is turned on.
  config.consider_all_requests_local       = false
  config.action_controller.perform_caching = true

  # Ensures that a master key has been made available in either ENV["RAILS_MASTER_KEY"]
  # or in config/master.key. This key is used to decrypt credentials (and other encrypted files).
  # config.require_master_key = true

  # Disable serving static files from the `/public` folder by default since
  # Apache or NGINX already handles this.
  config.public_file_server.enabled = ENV['RAILS_SERVE_STATIC_FILES'].present?

  # Compress CSS using a preprocessor.
  # config.assets.css_compressor = :sass

  # Do not fallback to assets pipeline if a precompiled asset is missed.
  config.assets.compile = true

  # Enable serving of images, stylesheets, and JavaScripts from an asset server.
  # config.action_controller.asset_host = 'http://assets.example.com'

  # Specifies the header that your server uses for sending files.
  # config.action_dispatch.x_sendfile_header = 'X-Sendfile' # for Apache
  # config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect' # for NGINX

  # Store uploaded files on the local file system (see config/storage.yml for options).
  config.active_storage.service = :amazon

  # Mount Action Cable outside main process or domain.
  # config.action_cable.mount_path = nil
  # config.action_cable.url = 'wss://example.com/cable'
  # config.action_cable.allowed_request_origins = [ 'http://example.com', /http://example.*/ ]

  # Force all access to the app over SSL, use Strict-Transport-Security, and use secure cookies.
  # config.force_ssl = true

  # Use the lowest log level to ensure availability of diagnostic information
  # when problems arise.
  config.log_level = :debug

  # Prepend all log lines with the following tags.
  config.log_tags = [ :request_id ]

  # Use a different cache store in production.
  # config.cache_store = :mem_cache_store

  # Use a real queuing backend for Active Job (and separate queues per environment).
  # config.active_job.queue_adapter     = :resque
  # config.active_job.queue_name_prefix = "coedo_production"

  config.action_mailer.perform_caching = false

  # Ignore bad email addresses and do not raise email delivery errors.
  # Set this to true and configure the email server for immediate delivery to raise delivery errors.
  # config.action_mailer.raise_delivery_errors = false

  # Enable locale fallbacks for I18n (makes lookups for any locale fall back to
  # the I18n.default_locale when a translation cannot be found).
  config.i18n.fallbacks = true

  # Send deprecation notices to registered listeners.
  config.active_support.deprecation = :notify

  # Use default logging formatter so that PID and timestamp are not suppressed.
  config.log_formatter = ::Logger::Formatter.new

  # Use a different logger for distributed setups.
  # require 'syslog/logger'
  # config.logger = ActiveSupport::TaggedLogging.new(Syslog::Logger.new 'app-name')

  if ENV["RAILS_LOG_TO_STDOUT"].present?
    logger           = ActiveSupport::Logger.new(STDOUT)
    logger.formatter = config.log_formatter
    config.logger    = ActiveSupport::TaggedLogging.new(logger)
  end

  # Do not dump schema after migrations.
  config.active_record.dump_schema_after_migration = false

  # Inserts middleware to perform automatic connection switching.
  # The `database_selector` hash is used to pass options to the DatabaseSelector
  # middleware. The `delay` is used to determine how long to wait after a write
  # to send a subsequent read to the primary.
  #
  # The `database_resolver` class is used by the middleware to determine which
  # database is appropriate to use based on the time delay.
  #
  # The `database_resolver_context` class is used by the middleware to set
  # timestamps for the last write to the primary. The resolver uses the context
  # class timestamps to determine how long to wait before reading from the
  # replica.
  #
  # By default Rails will store a last write timestamp in the session. The
  # DatabaseSelector middleware is designed as such you can define your own
  # strategy for connection switching and pass that into the middleware through
  # these configuration options.
  # config.active_record.database_selector = { delay: 2.seconds }
  # config.active_record.database_resolver = ActiveRecord::Middleware::DatabaseSelector::Resolver
  # config.active_record.database_resolver_context = ActiveRecord::Middleware::DatabaseSelector::Resolver::Session

end

試したこと

application.rb(config/)に
config.assets.initialize_on_precompile = false と記入するが別のエラー画面が出てきます。

補足情報（FW/ツールのバージョンなど）

以前AWSのEC2にデプロイしたのが原因なのでしょうか。