NameError uninitialized constant MyWorker::MyController - ruby-on-rails

Question

I'm using sidekiq to do a simple sample worker. When a make a request to my endpoint, it finished successfully but in the worker I got the following error:
*** NameError Exception: uninitialized constant SaveMessageWorker::Message
I'm using:
ruby 2.5.7
rails 5.2.3
sidekiq 6.0.0
This is part of my api rails project structure:
app
---controllers
------api
---------v1
------------messages_controller.rb
---workers
------save_message_worker.rb
config
---initializers
------sidekiq.rb
---application.rb
These are my files and paths:
app/workers/save_message_worker.rb
class SaveMessageWorker
include Sidekiq::Worker
def perform(message_list)
# byebug
# When I tried the below line, I got: *** NameError Exception: uninitialized constant SaveMessageWorker::Message
message = Message.new(message: message_list)
end
end
app/controllers/api/v1/messages_controller.rb
def multiple_concurrent_workers
begin
SaveMessageWorker.perform_async("Hello World!")
return (render json: {status: "success", data:"processed successfully"})
rescue => exception
logger.error CONTROLLER_NAME + ': An error happened in method multiple_concurrent_workers: ' + exception.to_json
return (render json: {status: "error", message: exception})
end
end
config/routes.rb
Rails.application.routes.draw do
require 'sidekiq/web'
mount Sidekiq::Web => '/sidekiq'
devise_for :users
namespace :api, defaults: { format: "json" } do
namespace :v1 do
resources :messages do
collection do
post :multiple_concurrent_workers
end
end
end
end
end
config/initializers/sidekiq.rb
Sidekiq.configure_server do |config|
config.redis = { url: 'redis://' + Rails.application.credentials[Rails.env.to_sym][:redis][:host].to_s + ':' +Rails.application.credentials[Rails.env.to_sym][:redis][:port].to_s + '/' + Rails.application.credentials[Rails.env.to_sym][:redis][:database].to_s }
end
Sidekiq.configure_client do |config|
config.redis = { url: 'redis://' + Rails.application.credentials[Rails.env.to_sym][:redis][:host].to_s + ':' +Rails.application.credentials[Rails.env.to_sym][:redis][:port].to_s + '/' + Rails.application.credentials[Rails.env.to_sym][:redis][:database].to_s }
end
config/application.rb
require_relative 'boot'
require "rails"
require "active_model/railtie"
require "active_job/railtie"
require "active_record/railtie"
require "active_storage/engine"
require "action_controller/railtie"
require "action_mailer/railtie"
require "action_view/railtie"
require "action_cable/engine"
require "rails/test_unit/railtie"
Bundler.require(*Rails.groups)
module IbeenDev
class Application < Rails::Application
config.load_defaults 5.2
config.middleware.use Rack::MethodOverride
config.middleware.use ActionDispatch::Cookies
config.middleware.use ActionDispatch::Session::CookieStore
config.middleware.use ActionDispatch::Flash
config.log_level = :error
config.autoload_paths << Rails.root.join("lib")
config.eager_load_paths << Rails.root.join("lib")
config.api_only = true
Koala.config.api_version = 'v2.0'
config.active_job.queue_adapter = :sidekiq
end
end
There was an opened issued in the github project, but author said that this is not an exactly sidekiq problem.
Can anyone help me to find the solution? Any help will be appreciated