serveur rails rhe ne fonctionne pas après avoir changé Gemfile

Question

quand j'utilise rails new (khar) et aller à Khar dir exécuter rails server son très bon et agréable mais quand je change fichier petit bijou à

source 'https://rubygems.org' 

git_source(:github) do |repo_name| 
    repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include?("/") 
    "https://github.com/#{repo_name}.git" 
end 


gem 'rails', '~> 5.0.2' 
gem 'bcrypt', '~> 3.1', '>= 3.1.11' 
gem 'faker', '~> 1.7', '>= 1.7.3' 
gem 'carrierwave', '~> 1.1' 
gem 'mini_magick', '~> 4.7' 
gem 'fog', '~> 1.40' 
gem 'will_paginate', '~> 3.1', '>= 3.1.5' 
gem 'bootstrap-will_paginate', '~> 1.0' 
gem 'bootstrap-sass', '~> 3.3', '>= 3.3.7' 
gem 'sass-rails', '~> 5.0', '>= 5.0.6' 
gem 'uglifier', '~> 3.2' 
gem 'coffee-rails', '~> 4.2', '>= 4.2.1' 
gem 'jquery-rails', '~> 4.3', '>= 4.3.1' 
gem 'turbolinks', '~> 5.0', '>= 5.0.1' 
gem 'jbuilder', '~> 2.6', '>= 2.6.3' 
gem 'sdoc', '~> 0.4.2' 

group :development, :test do 
    gem 'sqlite3', '~> 1.3', '>= 1.3.13' 
    gem 'byebug', '~> 9.0', '>= 9.0.6' 
    gem 'web-console', '~> 3.5' 
    gem 'spring', '~> 2.0', '>= 2.0.1' 
end 

group :test do 
    gem 'minitest-reporters', '~> 1.1', '>= 1.1.14' 
    gem 'mini_backtrace', '~> 0.1.3' 
    gem 'guard-minitest', '~> 2.4', '>= 2.4.6' 
end 

group :production do 
    gem 'pg', '~> 0.20.0' 
    gem 'rails_12factor', '~> 0.0.3' 
    gem 'puma', '~> 3.8', '>= 3.8.2' 
end 

rails dose serveur fonctionne pas et donner moi ce message

=> Booting Puma 
=> Rails 5.0.2 application starting in development on http://localhost:3000 
=> Run `rails server -h` for more startup options 
Exiting 
/home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:293:in `require': Could not load the 'listen' gem. Add `gem 'listen'` to the development group of your Gemfile (LoadError) 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:293:in `block in require' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:259:in `load_dependency' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:293:in `require' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.2/lib/active_support/evented_file_update_checker.rb:55:in `block in initialize' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.2/lib/active_support/core_ext/kernel/reporting.rb:13:in `block in silence_warnings' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.2/lib/active_support/core_ext/kernel/reporting.rb:26:in `with_warnings' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.2/lib/active_support/core_ext/kernel/reporting.rb:13:in `silence_warnings' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.2/lib/active_support/evented_file_update_checker.rb:53:in `initialize' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.2/lib/active_support/i18n_railtie.rb:59:in `new' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.2/lib/active_support/i18n_railtie.rb:59:in `initialize_i18n' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.2/lib/active_support/i18n_railtie.rb:15:in `block in <class:Railtie>' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.2/lib/active_support/lazy_load_hooks.rb:41:in `execute_hook' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.2/lib/active_support/lazy_load_hooks.rb:50:in `block in run_load_hooks' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.2/lib/active_support/lazy_load_hooks.rb:49:in `each' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.2/lib/active_support/lazy_load_hooks.rb:49:in `run_load_hooks' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/application/finisher.rb:65:in `block in <module:Finisher>' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/initializable.rb:30:in `instance_exec' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/initializable.rb:30:in `run' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/initializable.rb:55:in `block in run_initializers' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/2.3.0/tsort.rb:228:in `block in tsort_each' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/2.3.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/2.3.0/tsort.rb:431:in `each_strongly_connected_component_from' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/2.3.0/tsort.rb:349:in `block in each_strongly_connected_component' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/2.3.0/tsort.rb:347:in `each' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/2.3.0/tsort.rb:347:in `call' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/2.3.0/tsort.rb:347:in `each_strongly_connected_component' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/2.3.0/tsort.rb:226:in `tsort_each' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/2.3.0/tsort.rb:205:in `tsort_each' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/initializable.rb:54:in `run_initializers' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/application.rb:352:in `initialize!' 
    from /home/professor/Desktop/khar/config/environment.rb:5:in `<top (required)>' 
    from /home/professor/Desktop/khar/config.ru:3:in `require_relative' 
    from /home/professor/Desktop/khar/config.ru:3:in `block in <main>' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rack-2.0.2/lib/rack/builder.rb:55:in `instance_eval' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rack-2.0.2/lib/rack/builder.rb:55:in `initialize' 
    from /home/professor/Desktop/khar/config.ru:in `new' 
    from /home/professor/Desktop/khar/config.ru:in `<main>' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rack-2.0.2/lib/rack/builder.rb:49:in `eval' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rack-2.0.2/lib/rack/builder.rb:49:in `new_from_string' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rack-2.0.2/lib/rack/builder.rb:40:in `parse_file' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rack-2.0.2/lib/rack/server.rb:319:in `build_app_and_options_from_config' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rack-2.0.2/lib/rack/server.rb:219:in `app' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/commands/server.rb:59:in `app' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rack-2.0.2/lib/rack/server.rb:354:in `wrapped_app' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/commands/server.rb:124:in `log_to_stdout' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/commands/server.rb:77:in `start' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:90:in `block in server' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:85:in `tap' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:85:in `server' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:49:in `run_command!' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/commands.rb:18:in `<top (required)>' 
    from /home/professor/Desktop/khar/bin/rails:9:in `require' 
    from /home/professor/Desktop/khar/bin/rails:9:in `<top (required)>' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/spring-2.0.1/lib/spring/client/rails.rb:28:in `load' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/spring-2.0.1/lib/spring/client/rails.rb:28:in `call' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/spring-2.0.1/lib/spring/client/command.rb:7:in `call' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/spring-2.0.1/lib/spring/client.rb:30:in `run' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/spring-2.0.1/bin/spring:49:in `<top (required)>' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/spring-2.0.1/lib/spring/binstub.rb:31:in `load' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/spring-2.0.1/lib/spring/binstub.rb:31:in `<top (required)>' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:68:in `require' 
    from /home/professor/.rbenv/versions/2.3.1/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:68:in `require' 
    from /home/professor/Desktop/khar/bin/spring:15:in `<top (required)>' 
    from bin/rails:3:in `load' 
    from bin/rails:3:in `<main>' 

où je fais une erreur? !!

Answer 1

Avez-vous lu le fichier journal?

Impossible de charger la gemme 'écouter'. Ajoutez gem 'listen' au groupe de développement de votre Gemfile (LoadError)

Answer 2

Avez-vous ajouté plus de gemmes à Gemfile? Vous n'avez pas mentionné si vous l'avez fait. Si oui, avez-vous exécuté bundle install après avoir ajouté des gemmes?