cannot load such file -- coffee_scriptで困っています。

前提・実現したいこと

初めて質問します。
現在Ruby on rails(6.0.3.1)でインスタグラムのクローンアプリを作成していて
コメント機能の非同期通信の実装をしている途中で以下のエラーが出ました。

発生している問題・エラーメッセージ

エラーメッセージ
LoadError in PostsController#index
cannot load such file -- coffee_script

該当のソースコード

haml
1!!!
2%html
3  %head
4    %meta{:content => "text/html; charset=UTF-8", "http-equiv" => "Content-Type"}/
5    %title Myapp
6    = csrf_meta_tags
7    = csp_meta_tag
8    = stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track': 'reload'
9    = javascript_include_tag 'application'
10  %body
11    = render 'layouts/notifications'
12    = yield

Gemfile
1source 'https://rubygems.org'
2git_source(:github) { |repo| "https://github.com/#{repo}.git" }
3
4ruby '2.6.5'
5
6# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
7gem 'rails', '~> 6.0.0'
8# Use mysql as the database for Active Record
9gem 'mysql2', '>= 0.4.4'
10# Use Puma as the app server
11gem 'puma', '~> 3.11'
12# Use SCSS for stylesheets
13gem 'sass-rails', '~> 5'
14# Transpile app-like JavaScript. Read more: https://github.com/rails/webpacker
15gem 'webpacker', '~> 4.0'
16# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
17gem 'turbolinks', '~> 5'
18# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
19gem 'jbuilder', '~> 2.7'
20# Use Redis adapter to run Action Cable in production
21# gem 'redis', '~> 4.0'
22# Use Active Model has_secure_password
23# gem 'bcrypt', '~> 3.1.7'
24
25# Use Active Storage variant
26# gem 'image_processing', '~> 1.2'
27
28# Reduces boot times through caching; required in config/boot.rb
29gem 'bootsnap', '>= 1.4.2', require: false
30
31group :development, :test do
32  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
33  gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
34end
35
36group :development do
37  # Access an interactive console on exception pages or by calling 'console' anywhere in the code.
38  gem 'web-console', '>= 3.3.0'
39  gem 'listen', '>= 3.0.5', '< 3.2'
40  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
41  gem 'spring'
42  gem 'spring-watcher-listen', '~> 2.0.0'
43end
44
45group :test do
46  # Adds support for Capybara system testing and selenium driver
47  gem 'capybara', '>= 2.15'
48  gem 'selenium-webdriver'
49  # Easy installation and use of web drivers to run system tests with browsers
50  gem 'webdrivers'
51end
52
53# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
54gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
55
56gem "haml-rails", ">= 1.0", '<= 2.0.1'
57
58gem 'font-awesome-sass'
59
60gem 'devise'
61
62gem 'carrierwave'
63
64gem 'mini_magick'
65
66gem 'jquery-rails'
67