Rails Elastic Beanstalk deploy - sqlite3

I am trying to deploy a rails app to elastic beanstalk but getting an error.

INFO: Environment update is starting.                               
INFO: Deploying new version to instance(s).                         
ERROR: [Instance: i-053f6b1dfef0f156b] Command failed on instance. Return code: 1 Output: (TRUNCATED)...arrierwave.rb:2:in `block in <top (required)>'
/var/app/ondeck/config/initializers/carrierwave.rb:1:in `<top (required)>'
/var/app/ondeck/config/environment.rb:5:in `<top (required)>'
Tasks: TOP => environment
(See full trace by running task with --trace). 
Hook /opt/elasticbeanstalk/hooks/appdeploy/pre/11_asset_compilation.sh failed. For more detail, check /var/log/eb-activity.log using console or EB CLI.
INFO: Command execution completed on all instances. Summary: [Successful: 0, Failed: 1].
ERROR: Unsuccessful command execution on instance id(s) 'i-053f6b1dfef0f156b'. Aborting the operation.
ERROR: Failed to deploy application.                                

ERROR: Failed to deploy application.

Don't know why I am getting this Carrierwave error. I have that file to work with S3 to upload photos.

carrierwave.rb

CarrierWave.configure do |config|
    config.fog_credentials = {
        provider: "AWS",
        aws_access_key_id: ENV["AWS_ACCESS_KEY_ID"],
        aws_secret_access_key: ENV["AWS_SECRET_ACCESS_KEY"]
    }
    config.fog_directory = ENV["AWS_S3_BUCKET"]
end

environment.rb

# Load the Rails application.
require File.expand_path('../application', __FILE__)

# Initialize the Rails application.
Rails.application.initialize!

Here is the log:

EDIT HERE:

 ArgumentError: Missing required arguments: aws_access_key_id, aws_secret_access_key
  /var/app/ondeck/config/initializers/carrierwave.rb:2:in `block in <top (required)>'
  /var/app/ondeck/config/initializers/carrierwave.rb:1:in `<top (required)>'
  /var/app/ondeck/config/environment.rb:5:in `<top (required)>'
  Tasks: TOP => environment

EDIT2 my part of the gem file;

group :development, :test do
  gem 'sqlite3',     '1.3.9'
  gem 'byebug',      '3.4.0'
  gem 'web-console', '2.0.0.beta3'
  gem 'spring',      '1.1.3'
end

group :test do
  gem 'minitest-reporters', '1.0.5'
  gem 'mini_backtrace',     '0.1.3'
  gem 'guard-minitest',     '2.3.1'
end

group :production do
  gem 'pg',             '0.17.1'
  gem 'rails_12factor', '0.0.2'
end

and I created the RDS with postgresql. database.yml file;

# SQLite version 3.x
#   gem install sqlite3
#
#   Ensure the SQLite 3 gem is defined in your Gemfile
#   gem 'sqlite3'
#
default: &default
  adapter: sqlite3
  pool: 5
  timeout: 5000

development:
  <<: *default
  database: db/development.sqlite3

# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
  <<: *default
  database: db/test.sqlite3

production:
  <<: *default
  database: <%= ENV['RDS_DB_NAME'] %>#db/production.sqlite3
  username: <%= ENV['RDS_USERNAME'] %>
  password: <%= ENV['RDS_PASSWORD'] %>
  host: <%= ENV['RDS_HOSTNAME'] %>
  port: <%= ENV['RDS_PORT'] %>

getting an error of ;

ERROR: [Instance: i-053f6b1dfef0f156b] Command failed on instance. Return code: 1 Output: (TRUNCATED)...sqlite3'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord).

Gem::LoadError: sqlite3 is not part of the bundle. Add it to Gemfile.

why should I add gem sqlite3?, I have it already in development and should use in production. That is how Heroku works. I thought the same for elastic beanstalk