Precompiling assets failed が治りません(Herokuデプロイ)[Railsチュートリアル11章]

Question

前提・実現したいこと

本番環境にデプロイしたい。

発生している問題・エラーメッセージ

Rails Tutorialを学習している者です。
11章の終盤、アカウント有効化を実装したウェブサイトを本番環境にデプロイしようとしたところ以下のようなメッセージが出て、
一部デプロイできないことがわかったのですが、どうすればいいか分からず、見事にハマっています。NameErrorの部分が原因だと思うのですが、なかなか解決できない状況です。

エラーメッセージ

remote:  !
remote:  !     Precompiling assets failed.
remote:  !
remote: 

該当のソースコード(ターミナル)

git push heroku #実行コマンド
　　　　　：　　#省略
remote: 
remote: -----> Ruby app detected
remote: -----> Compiling Ruby/Rails
remote: -----> Using Ruby version: ruby-2.5.3
remote:        :　　　　#省略
remote:        :
remote:        Warning: the running version of Bundler (1.15.2) is older than the version that created the lockfile (1.17.2). 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: -----> Installing node-v10.14.1-linux-x64
remote: -----> Detecting rake tasks
remote: -----> Preparing app for Rails asset pipeline
remote:        Running: rake assets:precompile
remote:        rake aborted!
remote:        NameError: undefined local variable or method `　config' for #<SampleApp::Application:0x0000557bb768cd00>
remote:        /tmp/build_7a2ce75555da1d95e3c1edc54374905e/config/environments/production.rb:68:in `block in <top (required)>'
remote:        /tmp/build_7a2ce75555da1d95e3c1edc54374905e/vendor/bundle/ruby/2.5.0/gems/railties-5.1.6/lib/rails/railtie.rb:211:in `instance_eval'
remote:        /tmp/build_7a2ce75555da1d95e3c1edc54374905e/vendor/bundle/ruby/2.5.0/gems/railties-5.1.6/lib/rails/railtie.rb:211:in `configure'
remote:        /tmp/build_7a2ce75555da1d95e3c1edc54374905e/config/environments/production.rb:1:in `<top (required)>'
remote:        /tmp/build_7a2ce75555da1d95e3c1edc54374905e/vendor/bundle/ruby/2.5.0/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:292:in `require'
remote:        /tmp/build_7a2ce75555da1d95e3c1edc54374905e/vendor/bundle/ruby/2.5.0/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:292:in `block in require'
remote:        /tmp/build_7a2ce75555da1d95e3c1edc54374905e/vendor/bundle/ruby/2.5.0/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:258:in `load_dependency'
                            :
                            :
                            :   #字数制限のため1部省略
　　　　　　　　　　　　　　　　 

remote:        Tasks: TOP => environment
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: Verifying deploy...
remote: 
remote: !       Push rejected to 自分のクラウドIDE.
remote: 
To https://自分のクラウドIDE.git
 ! [remote rejected]   master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.自分のクラウドIDE.git'

production.rb(config/environments)のソースコード↓

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

  # Attempt to read encrypted secrets from `config/secrets.yml.enc`.
  # Requires an encryption key in `ENV["RAILS_MASTER_KEY"]` or
  # `config/secrets.yml.key`.
  config.read_encrypted_secrets = 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 JavaScripts and CSS.
  config.assets.js_compressor = :uglifier
  # config.assets.css_compressor = :sass

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

  # `config.assets.precompile` and `config.assets.version` have moved to config/initializers/assets.rb

  # 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

  # 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
  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 = "sample_app_#{Rails.env}"
  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 = true
  config.action_mailer.delivery_method = :smtp
  host = '自分のクラウドIDE'
  config.action_mailer.default_url_options = { host: host }
  ActionMailer::Base.smtp_settings = {
    :address        => 'smtp.sendgrid.net',
    :port           => '587',
    :authentication => :plain,
    :user_name      => ENV['SENDGRID_USERNAME'],
    :password       => ENV['SENDGRID_PASSWORD'],
    :domain         => 'heroku.com',
    :enable_starttls_auto => true
  }
  # 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
end

application.rbのソースコード(config/)↓

require 'rails/all'

# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(*Rails.groups)

module SampleApp
  class Application < Rails::Application
    # Initialize configuration defaults for originally generated Rails version.
    # Settings in config/environments/* take precedence over those specified here.
    # Application configuration should go into files in config/initializers
    # -- all .rb files in that directory are automatically loaded.
    config.assets.initialize_on_precompile = false
    
    # Include the authenticity token in remote forms.
    config.action_view.embed_authenticity_token_in_remote_forms = true
  end
end
コード

試したこと

他サイトで有力だった config.assets.initialize_on_precompile = false をapplication.rb(config/)に入れたりするも変化なし。

ここにより詳細な情報を記載してください。

Answer 1

 NameError: undefined local variable or method `　config' 

クリティカルなエラーはこちらですね。
congifの前に全角スペースが入っているようです。

config/enconfig/environments/production.rbvironments/production.rb に全角スペースがないか確認してみてください。