In the development environment, I was able to save the file to S3 using the carrier wave gem, but when I moved it in the production environment, I got an error.

ec2-user terminal:
"Missing required arguments: aws_access_key_id, aws_secret_access_key (ArgumentError)"

ruby 2.5.7
ruby on rails 5.2.4

I did a lot of research without knowing it, but I saw how to solve this error by writing aws_key in credentials.yml.enc and deploy.rb, but deploy in my file It wasn't helpful because there is no .rb.
Also, carrierwave.rb uses environment variables instead of credentials, so this wasn't helpful either.
I also changed the bucket settings and looked at it, but I think that this is also okay because nothing is blocked in the current state.

I want to eliminate this error so that the image can be displayed normally in the production environment.
fog-core-2.2.0/lib/fog/core/service.rb:244: in `validate_options' I would like to know if there is a way to put aws_access_key_id directly here. Thank you.

Bucket settings
Block all public access
off
Block public access to buckets and objects allowed through new access control lists (ACLs)
off
Block public access to buckets and objects granted through any access control list (ACL)
off
Block public access to buckets and objects granted through a new public bucket policy or access point policy
off
Block public and cross-account access to buckets and objects through any public bucket policy or access point policy
off

Bucket policy
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "Stmt000001",
            "Effect": "Allow",
            "Principal": {
                "AWS": "arn: aws: iam :: **********: user/******"
            },
            "Action": "s3 *",
            "Resource": "arn: aws: s3 ::: ********"
        }
    ]
}

.env file
DB_USERNAME = "root"
DB_PASSWORD = "En ***********"
DB_HOST = "rds-mysql-server.cum50tloc8cp.ap-northeast-1.rds.amazonaws.com"
DB_DATABASE = "t ******"
AWS_ACCESS_KEY_ID = "AKI ********"
AWS_SECRET_ACCESS_KEY = "wt7 ***********************"

carrierwave.rb
require'carrierwave/storage/abstract'
require'carrierwave/storage/file'
require'carrierwave/storage/fog'
CarrierWave.configure do | config |
    config.storage: fog
    config.fog_provider ='fog/aws'
    config.fog_directory ='*******' # Describe the created bucket name
    config.fog_credentials = {
      provider:'AWS',
      aws_access_key_id: ENV ['AWS_ACCESS_KEY_ID'], #environment variables
      aws_secret_access_key: ENV ['AWS_SECRET_ACCESS_KEY'], #environment variables
      region:'ap-northeast-1', # When Asia Pacific (Tokyo) is selected
      path_style: true
    }
end

include CarrierWave :: MiniMagick
  storage: fog
  def store_dir
    "uploads/# {model.class.to_s.underscore}/# {mounted_as}/# {model.id}"
  end
  def extension_whitelist
    % w (jpg jpeg gif png)
  end
  process: resize_to_limit =>[700, 700]
  version: thumb do
   process resize_to_fit: [62.5, 62.5]
  end
  version: thumb50 do
   process resize_to_fit: [62.5, 62.5]
  end
  def filename
     "# {secure_token}. # {File.extension}" if original_filename.present?
  end
  protected
  def secure_token
     var =: "@ # {mounted_as} _secure_token"
     model.instance_variable_get (var) or model.instance_variable_set (var, SecureRandom.uuid)
  end
end