HEROKUにRailsアプリをVagrantからpushする際にでるエラーが出て、pushできません。

Herokuでpushする

Vagrant上で作ったアプリをHEROKUにデプロイしようとしたができない

発生している問題・エラーメッセージ

Ruby app detected
-----> Compiling Ruby/Rails
-----> Using Ruby version: ruby-2.5.1
-----> Installing dependencies using bundler 2.0.1
Running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin -j4 --deployment
/tmp/build_90ff1020da4c42909a47ffa584afd193/vendor/ruby-2.5.1/lib/ruby/2.5.0/rubygems.rb:289:in find_spec_for_exe': can't find gem bundler (>= 0.a) with executable bundle (Gem::GemNotFoundException) from /tmp/build_90ff1020da4c42909a47ffa584afd193/vendor/ruby-2.5.1/lib/ruby/2.5.0/rubygems.rb:308:in activate_bin_path'
from vendor/bundle/ruby/2.5.0/bin/bundle:23:in <main>' Bundler Output: /tmp/build_90ff1020da4c42909a47ffa584afd193/vendor/ruby-2.5.1/lib/ruby/2.5.0/rubygems.rb:289:in find_spec_for_exe': can't find gem bundler (>= 0.a) with executable bundle (Gem::GemNotFoundException)
from /tmp/build_90ff1020da4c42909a47ffa584afd193/vendor/ruby-2.5.1/lib/ruby/2.5.0/rubygems.rb:308:in activate_bin_path' from vendor/bundle/ruby/2.5.0/bin/bundle:23:in <main>'
!
! Failed to install gems via Bundler.
!
! Push rejected, failed to compile Ruby app.
! Push failed

gemファイル

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', '~> 5.2.1'
# Use sqlite3 as the database for Active Record

# 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

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

gem 'email_validator', '~> 1.6'
gem 'rails-i18n', '~> 5.1'
gem 'kaminari'
gem 'kaminari-i18n'
gem 'jquery-rails'
gem 'acts_as_list'

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 'sqlite3'
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

group :production do
  gem 'pg', '~> 0.18.4'
end

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