railsのHerokuデプロイができない

rails初心者です。

HEROKUでrailsアプリのデプロイを試みているのですがエラーが出てしまいデプロイができません。
色々調べて試したのですが解決法がわかりません。
出ているエラーは下記になります。

ターミナル

remote:  !
remote:  !     Could not detect rake tasks
remote:  !     ensure you can run `$ bundle exec rake -P` against your app
remote:  !     and using the production group of your Gemfile.
remote:  !     rake aborted!
remote:  !     NoMethodError: undefined method `web_console' for #<Rails::Application::Configuration:0x000056330a15d1f8>
remote:  !     /tmp/build_442c99b6b3441012d291b5f7c34b385f/vendor/bundle/ruby/2.6.0/gems/railties-5.2.3/lib/rails/railtie/configuration.rb:97:in `method_missing'
remote:  !     /tmp/build_442c99b6b3441012d291b5f7c34b385f/config/application.rb:14:in `<class:Application>'
remote:  !     /tmp/build_442c99b6b3441012d291b5f7c34b385f/config/application.rb:10:in `<module:Pictgram>'
remote:  !     /tmp/build_442c99b6b3441012d291b5f7c34b385f/config/application.rb:9:in `<top (required)>'
remote:  !     /tmp/build_442c99b6b3441012d291b5f7c34b385f/Rakefile:4:in `require_relative'
remote:  !     /tmp/build_442c99b6b3441012d291b5f7c34b385f/Rakefile:4:in `<top (required)>'
remote:  !     /tmp/build_442c99b6b3441012d291b5f7c34b385f/vendor/bundle/ruby/2.6.0/gems/rake-13.0.1/lib/rake/rake_module.rb:29:in `load'
remote:  !     /tmp/build_442c99b6b3441012d291b5f7c34b385f/vendor/bundle/ruby/2.6.0/gems/rake-13.0.1/lib/rake/rake_module.rb:29:in `load_rakefile'
remote:  !     /tmp/build_442c99b6b3441012d291b5f7c34b385f/vendor/bundle/ruby/2.6.0/gems/rake-13.0.1/lib/rake/application.rb:703:in `raw_load_rakefile'
remote:  !     /tmp/build_442c99b6b3441012d291b5f7c34b385f/vendor/bundle/ruby/2.6.0/gems/rake-13.0.1/lib/rake/application.rb:104:in `block in load_rakefile'
remote:  !     /tmp/build_442c99b6b3441012d291b5f7c34b385f/vendor/bundle/ruby/2.6.0/gems/rake-13.0.1/lib/rake/application.rb:186:in `standard_exception_handling'
remote:  !     /tmp/build_442c99b6b3441012d291b5f7c34b385f/vendor/bundle/ruby/2.6.0/gems/rake-13.0.1/lib/rake/application.rb:103:in `load_rakefile'
remote:  !     /tmp/build_442c99b6b3441012d291b5f7c34b385f/vendor/bundle/ruby/2.6.0/gems/rake-13.0.1/lib/rake/application.rb:82:in `block in run'
remote:  !     /tmp/build_442c99b6b3441012d291b5f7c34b385f/vendor/bundle/ruby/2.6.0/gems/rake-13.0.1/lib/rake/application.rb:186:in `standard_exception_handling'
remote:  !     /tmp/build_442c99b6b3441012d291b5f7c34b385f/vendor/bundle/ruby/2.6.0/gems/rake-13.0.1/lib/rake/application.rb:80:in `run'
remote:  !     /tmp/build_442c99b6b3441012d291b5f7c34b385f/vendor/bundle/ruby/2.6.0/gems/rake-13.0.1/exe/rake:27:in `<top (required)>'
remote:  !     vendor/bundle/bin/rake:29:in `load'
remote:  !     vendor/bundle/bin/rake:29:in `<main>'
remote:  !

中略

remote: !       Push rejected to rocky-sierra-97371.
remote: 
To https://git.heroku.com/rocky-sierra-97371.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/rocky-sierra-97371.git'

Gemfile

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

ruby '2.6.3'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 5.2.0'
# Use mysql as the database for Active Record
gem 'mysql2', group: :development
# Use Puma as the app server
gem 'puma', '~> 3.11'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# 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

gem 'bootstrap-sass'
gem 'jquery-rails'
gem 'bcrypt'
gem 'carrierwave'
gem 'rmagick'

# 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]
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'
  gem 'pry-rails'
  gem 'pry-doc'
  gem 'pry-byebug'
  gem 'pry-stack_explorer'
end

group :production do
  gem 'pg'
end

group :test do
  # Adds support for Capybara system testing and selenium driver
  gem 'capybara', '>= 2.15', '< 4.0'
  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]

ぜひ、ご教示お願いします。