NoMethodError: undefined method `eager_load_paths' for #<I18n::Config:0x00007fceade8c0f0> - ruby-on-rails

Question

In my rails 6 app running ruby 2.7, I am trying to eager load all the files using Zeitwerk. Here is a snippet of my application.rb file:
class Application < Rails::Application
config.load_defaults "6.0"
Zeitwerk::Loader.eager_load_all
# Application configuration can go into files in config/initializers
# -- all .rb files in that directory are automatically loaded after loading
# the framework and any gems in your application.
# Middlewares
config.middleware.insert 0, Rack::UTF8Sanitizer
config.middleware.use Rack::Attack
config.autoload_paths += Dir["#{config.root}/lib/**/*"]
config.autoload_paths += Dir["#{config.root}/app/models/**/*"]
config.autoload_paths += Dir["#{config.root}/app/observers/*"]
config.autoload_paths += Dir["#{config.root}/app/middleware/*"]
config.autoload_paths += Dir["#{config.root}/app/validators/**/*"]
config.autoload_paths += Dir["#{config.root}/app/**/concerns/*"]
config.autoload_paths += Dir["#{config.root}/app/operations/**/*"]
config.autoload_paths += Dir["#{config.root}/app/scrubbers/**/*"]
config.autoload_paths += Dir["#{config.root}/app/workers/**/*"]
config.paths.add "#{config.root}/app/operations/", eager_load: true
# Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.
# Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.
config.time_zone = "UTC"
# The default locale is :en and all translations from config/locales/*.rb,yml are auto loaded.
config.i18n.load_path += Dir[Rails.root.join('config', 'locales', '**', '*.{rb,yml}')].reject { |f| File.fnmatch("#{Rails.root.to_s}/config/locales/**/x_*.yml", f) }
config.i18n.available_locales = [:"en", :"fr", :"fr_en"]
config.i18n.default_locale = :en
# Precompile additional assets.
# application.js, application.css, and all non-JS/CSS in app/assets folder are already added.
config.assets.precompile += ["public.css", "public.js", "public_payments.js", "email.css", "pdf.css", "pronotif.css"]
config.middleware.insert_before 0, Rack::Cors do
allow do
origins '*'
resource '*', :headers => :any, :methods => [:get, :post, :options]
end
end
end
However, when I run this I get this error:
NoMethodError: undefined method `eager_load_paths' for #<I18n::Config:0x00007fceade8c0f0>
Any solution for this will be helpful

Answer 1

Problem
Aside from the fact that your application.rb is not in a good shape (as #max mentioned in the first comment to your question) the problem is known and already fixed for Rails.
Unfortunately (as time of writing, with Rails 6.0.2.2) the fix is currently not public.
Temporary Workaround
But until then you might copy the patched rake task to your app under a file named lib/tasks/local_zeitwerk.rake and change line 41 to:
namespace :local_zeitwerk do
and then execute the check task with
bin/rails local_zeitwerk:check