デプロイでエラー Capstrano 誰か答えてよ

Question

下記の自動デプロイのコマンドを実行すると、エラーが起こります
deploy.rbやCapfileが原因のような気がしますが、変にいじった記憶はないです
何が悪いのでしょうか？

実行

bundle exec cap production deploy

###エラー内容

ERROR: load:defaults has already been invoked and can no longer be modified.
Check that you haven't loaded a Capistrano plugin in deploy.rb or a stage
(e.g. deploy/production.rb) by mistake.
Plugins must be loaded in the Capfile to initialize properly.
(Backtrace restricted to imported tasks)
cap aborted!
FrozenError: can't modify frozen #<Class:#<Rake::Task:0x00007fdf380bd1b8>>

Tasks: TOP => production
(See full trace by running task with --trace)

###各ファイル

deploy.rb

config valid only for current version of Capistrano

lock '3.14.1'


set :application, 'baseball-app'

set :repo_url,  '[e-mail]:katou02/baseball-app.git'


set :linked_dirs, fetch(:linked_dirs, []).push('log', 'tmp/pids', 'tmp/cache', 'tmp/sockets', 'vendor/bundle', 'public/system', 'public/uploads')

set :rbenv_type, :user
set :rbenv_ruby, '2.5.1'


set :ssh_options, auth_methods: ['publickey'],
                  keys: ['~/.ssh/Rails-app.pem'] 


set :unicorn_pid, -> { "#{shared_path}/tmp/pids/unicorn.pid" }


set :unicorn_config_path, -> { "#{current_path}/config/unicorn.rb" }
set :keep_releases, 5


after 'deploy:publishing', 'deploy:restart'
namespace :deploy do
  task :restart do
    invoke 'unicorn:restart'
  end
end

require "capistrano/scm/git"
install_plugin Capistrano::SCM::Git

Capfile

require "capistrano/setup"
require "capistrano/deploy"
require 'capistrano/rbenv'
require 'capistrano/bundler'
require 'capistrano/rails/assets'
require 'capistrano/rails/migrations'
require 'capistrano3/unicorn'

Dir.glob("lib/capistrano/tasks/*.rake").each { |r| import r }

Gemfile

source 'https://rubygems.org'
git_source(:github) { |repo| "https://github.com/#{repo}.git" }

ruby '2.5.1'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 5.2.3'
# Use mysql as the database for Active Record
gem 'mysql2', '0.5.2'
# Use Puma as the app server
gem 'puma', '~> 3.11'
# Use SCSS for stylesheets
gem 'sass-rails', '5.0.7'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'mini_racer', platforms: :ruby

# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.2'
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.5'
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 4.0'
# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use ActiveStorage variant
# gem 'mini_magick', '~> 4.8'

# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development

# Reduces boot times through caching; required in config/boot.rb
gem 'bootsnap', '>= 1.1.0', require: false

group :development, :test do
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
  gem 'capistrano'
  gem 'capistrano-rbenv'
  gem 'capistrano-bundler'
  gem 'capistrano-rails'
  gem 'capistrano3-unicorn'
end

group :development do
  # Access an interactive console on exception pages or by calling 'console' anywhere in the code.
  gem 'web-console', '>= 3.3.0'
  gem 'listen', '>= 3.0.5', '< 3.2'
  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'
  gem 'spring-watcher-listen', '~> 2.0.0'
end

group :test do
  # Adds support for Capybara system testing and selenium driver
  gem 'capybara', '>= 2.15'
  gem 'selenium-webdriver'
  # Easy installation and use of chromedriver to run system tests with Chrome
  gem 'chromedriver-helper'
end

# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

gem 'pry-rails'
gem 'compass-rails', '3.1.0'
gem 'sprockets', '3.7.2'
gem 'kaminari'
gem 'jquery-rails'
gem 'fullcalendar-rails'
gem 'momentjs-rails'
gem 'rails-i18n'
gem 'devise'
gem 'carrierwave'
gem 'mini_magick'
gem "font-awesome-sass"
gem 'ancestry'
# gem 'fog-aws'

group :production do
  gem 'unicorn', '5.4.1'
end

Gemfile.lock

RUBY VERSION
   ruby 2.5.1p57

BUNDLED WITH
   2.1.4