Heroku デプロイ　エラー

Herokuでデプロイ中にエラーが出てしまいます。
おそらくwebpackが原因かと思いますがどのようにすればよろしいでしょうか？

Heroku
1 Compiling...
2       Compilation failed:
3       /tmp/build_49d167b2_/node_modules/webpack-cli/bin/cli.js:93
4       				throw err;
5       				^
6       
7       Error: Cannot find module 'vue-loader'
8       Require stack:
9       - /tmp/build_49d167b2_/config/webpack/environment.js
10       - /tmp/build_49d167b2_/config/webpack/production.js
11       - /tmp/build_49d167b2_/node_modules/webpack-cli/bin/utils/convert-argv.js
12       - /tmp/build_49d167b2_/node_modules/webpack-cli/bin/cli.js
13       - /tmp/build_49d167b2_/node_modules/webpack/bin/webpack.js
14           at Function.Module._resolveFilename (internal/modules/cjs/loader.js:980:15)
15           at Function.Module._load (internal/modules/cjs/loader.js:862:27)
16           at Module.require (internal/modules/cjs/loader.js:1042:19)
17           at require (/tmp/build_49d167b2_/node_modules/v8-compile-cache/v8-compile-cache.js:161:20)
18           at Object.<anonymous> (/tmp/build_49d167b2_/config/webpack/environment.js:2:29)
19           at Module._compile (/tmp/build_49d167b2_/node_modules/v8-compile-cache/v8-compile-cache.js:194:30)
20           at Object.Module._extensions..js (internal/modules/cjs/loader.js:1176:10)
21           at Module.load (internal/modules/cjs/loader.js:1000:32)
22           at Function.Module._load (internal/modules/cjs/loader.js:899:14)
23           at Module.require (internal/modules/cjs/loader.js:1042:19)
24           at require (/tmp/build_49d167b2_/node_modules/v8-compile-cache/v8-compile-cache.js:161:20)
25           at Object.<anonymous> (/tmp/build_49d167b2_/config/webpack/production.js:3:21)
26           at Module._compile (/tmp/build_49d167b2_/node_modules/v8-compile-cache/v8-compile-cache.js:194:30)
27           at Object.Module._extensions..js (internal/modules/cjs/loader.js:1176:10)
28           at Module.load (internal/modules/cjs/loader.js:1000:32)
29           at Function.Module._load (internal/modules/cjs/loader.js:899:14)
30           at Module.require (internal/modules/cjs/loader.js:1042:19)
31           at require (/tmp/build_49d167b2_/node_modules/v8-compile-cache/v8-compile-cache.js:161:20)
32           at WEBPACK_OPTIONS (/tmp/build_49d167b2_/node_modules/webpack-cli/bin/utils/convert-argv.js:114:13)
33           at requireConfig (/tmp/build_49d167b2_/node_modules/webpack-cli/bin/utils/convert-argv.js:116:6)
34           at /tmp/build_49d167b2_/node_modules/webpack-cli/bin/utils/convert-argv.js:123:17
35           at Array.forEach (<anonymous>)
36           at module.exports (/tmp/build_49d167b2_/node_modules/webpack-cli/bin/utils/convert-argv.js:121:15)
37           at /tmp/build_49d167b2_/node_modules/webpack-cli/bin/cli.js:71:45
38           at Object.parse (/tmp/build_49d167b2_/node_modules/yargs/yargs.js:576:18)
39           at /tmp/build_49d167b2_/node_modules/webpack-cli/bin/cli.js:49:8
40           at Object.<anonymous> (/tmp/build_49d167b2_/node_modules/webpack-cli/bin/cli.js:366:3)
41           at Module._compile (internal/modules/cjs/loader.js:1156:30)
42           at Object.Module._extensions..js (internal/modules/cjs/loader.js:1176:10)
43           at Module.load (internal/modules/cjs/loader.js:1000:32)
44           at Function.Module._load (internal/modules/cjs/loader.js:899:14)
45           at Module.require (internal/modules/cjs/loader.js:1042:19)
46           at require (internal/modules/cjs/helpers.js:77:18)
47           at Object.<anonymous> (/tmp/build_49d167b2_/node_modules/webpack/bin/webpack.js:156:2)
48           at Module._compile (internal/modules/cjs/loader.js:1156:30)
49           at Object.Module._extensions..js (internal/modules/cjs/loader.js:1176:10) {
50         code: 'MODULE_NOT_FOUND',
51         requireStack: [
52           '/tmp/build_49d167b2_/config/webpack/environment.js',
53           '/tmp/build_49d167b2_/config/webpack/production.js',
54           '/tmp/build_49d167b2_/node_modules/webpack-cli/bin/utils/convert-argv.js',
55           '/tmp/build_49d167b2_/node_modules/webpack-cli/bin/cli.js',
56           '/tmp/build_49d167b2_/node_modules/webpack/bin/webpack.js'
57         ]
58       }
59       
60 !
61 !     Precompiling assets failed.
62 !
63 !     Push rejected, failed to compile Ruby app.
64 !     Push failed

Gemfile

rails
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', '0.5.3'
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]
34  gem 'sqlite3' #do ~ end内部に追加。他のgemは残してください。
35end
36
37group :development do
38  # Access an interactive console on exception pages or by calling 'console' anywhere in the code.
39  gem 'web-console', '>= 3.3.0'
40  gem 'listen', '>= 3.0.5', '< 3.2'
41  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
42  gem 'spring'
43  gem 'spring-watcher-listen', '~> 2.0.0'
44end
45
46group :test do
47  # Adds support for Capybara system testing and selenium driver
48  gem 'capybara', '>= 2.15'
49  gem 'selenium-webdriver'
50  # Easy installation and use of web drivers to run system tests with browsers
51  gem 'webdrivers'
52end
53
54# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
55gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
56gem 'pry-rails'
57# gem "haml-rails", ">= 1.0", '<= 2.0.1'
58gem 'devise'
59gem 'carrierwave'
60gem 'mini_magick'
61gem 'font-awesome-sass'
62gem 'haml-rails'
63gem 'erb2haml'
64gem 'jquery-rails'
65gem 'simple_calendar', '~> 2.0'
66group :production do
67  gem 'pg'
68end