Redis::cannotconnecterror error connecting to redis on redis:6379

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Ruby

Rails

it's my first time using rails,redis and sidekiq,and I have been facing this error all day and didn't reach any solution , I saw a lot solutions to this error but it didn't work for me, so I don't know where's the problem

when i try the end point sometimes i get this error and sometime i got another error like this >> NoMethodError (undefined method `HGET' for nil:NilClass):

my versions are ruby: '2.6.10' , rails: '5.2.8', mysql2 for database , windows 10

I have .env

REDIS_URL=redis://redis:6379

then I created sideqik.rb , redis.rb files in config>initializers
sideqik.rb

Sidekiq.configure_server do |config|
  config.redis = { url: ENV["REDIS_URL"] }
end
  
Sidekiq.configure_client do |config|
  config.redis = { url: ENV["REDIS_URL"] }
end

redis.rb

$redis= Redis.new(url: ENV["REDIS_URL"])

# when i write redis without $ , I can't access it in controller or worker file so i don't know if this how I should define it or there's another way

and in config>application.rb inside application class i put this code

config.active_job.queue_adapter = :sidekiq

What I have tried:

I have tried to change the url in .env as some solutions said to 'redis:6379' but still same error, and when i change it to localhost:6379 i got error with rails server
also I tries to install

gem 'redis-rail'

and added this in env

config.cache_store = :redis_store, {
    host: "localhost",
    port: 6379,
    db: 0,
    password: "mysecret",
    namespace: "cache"
  } , {
    expires_in: 90.minutes
}

but nothing happens and still the error as it

# while I was testing the end points the redis-server was running but nothing changed inside it