Cloud9でrailsのwebサイトを閲覧したいのですが、出来ません

Question

前提・実現したいこと

クロームでCloud9を使っています。OSはwindows10です。

発生している問題・エラーメッセージ

Cloud9でrails アプリケーションを作りたいのですが、rails sでサーバーを立ち上げて、Previewボタンを押してwebページを閲覧しようとしても、以下のようなエラーメッセージが表示されてうまくいきません。

Gem::LoadError
Specified 'sqlite3' for database adapter, but the gem is not loaded. Add `gem 'sqlite3'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord).
Extracted source (around line #176):
174
175
176
177
178
179
              
            require path_to_adapter
          rescue Gem::LoadError => e
            raise Gem::LoadError, "Specified '#{spec[:adapter]}' for database adapter, but the gem is not loaded. Add `gem '#{e.name}'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord)."
          rescue LoadError => e
            raise LoadError, "Could not load '#{path_to_adapter}'. Make sure that the adapter in config/database.yml is valid. If you use an adapter other than 'mysql2', 'postgresql' or 'sqlite3' add the necessary adapter gem to the Gemfile.", e.backtrace
          end

Rails.root: /home/ec2-user/environment/cravan

Application Trace | Framework Trace | Full Trace
activerecord (5.0.7.2) lib/active_record/connection_adapters/connection_specification.rb:176:in `rescue in spec'
activerecord (5.0.7.2) lib/active_record/connection_adapters/connection_specification.rb:173:in `spec'
activerecord (5.0.7.2) lib/active_record/connection_handling.rb:53:in `establish_connection'
activerecord (5.0.7.2) lib/active_record/railtie.rb:125:in `block (2 levels) in <class:Railtie>'
activesupport (5.0.7.2) lib/active_support/lazy_load_hooks.rb:69:in `instance_eval'
activesupport (5.0.7.2) lib/active_support/lazy_load_hooks.rb:69:in `block in execute_hook'
activesupport (5.0.7.2) lib/active_support/lazy_load_hooks.rb:60:in `with_execution_control'
activesupport (5.0.7.2) lib/active_support/lazy_load_hooks.rb:65:in `execute_hook'
activesupport (5.0.7.2) lib/active_support/lazy_load_hooks.rb:50:in `block in run_load_hooks'
activesupport (5.0.7.2) lib/active_support/lazy_load_hooks.rb:49:in `each'
activesupport (5.0.7.2) lib/active_support/lazy_load_hooks.rb:49:in `run_load_hooks'
activerecord (5.0.7.2) lib/active_record/base.rb:324:in `<module:ActiveRecord>'
activerecord (5.0.7.2) lib/active_record/base.rb:24:in `<top (required)>'
activesupport (5.0.7.2) lib/active_support/dependencies.rb:293:in `require'
activesupport (5.0.7.2) lib/active_support/dependencies.rb:293:in `block in require'
activesupport (5.0.7.2) lib/active_support/dependencies.rb:259:in `load_dependency'
activesupport (5.0.7.2) lib/active_support/dependencies.rb:293:in `require'
activerecord (5.0.7.2) lib/active_record/migration.rb:559:in `connection'
activerecord (5.0.7.2) lib/active_record/migration.rb:546:in `call'
actionpack (5.0.7.2) lib/action_dispatch/middleware/callbacks.rb:38:in `block in call'
activesupport (5.0.7.2) lib/active_support/callbacks.rb:97:in `__run_callbacks__'
activesupport (5.0.7.2) lib/active_support/callbacks.rb:750:in `_run_call_callbacks'
activesupport (5.0.7.2) lib/active_support/callbacks.rb:90:in `run_callbacks'
actionpack (5.0.7.2) lib/action_dispatch/middleware/callbacks.rb:36:in `call'
actionpack (5.0.7.2) lib/action_dispatch/middleware/executor.rb:12:in `call'
actionpack (5.0.7.2) lib/action_dispatch/middleware/remote_ip.rb:79:in `call'
actionpack (5.0.7.2) lib/action_dispatch/middleware/debug_exceptions.rb:49:in `call'
web-console (3.7.0) lib/web_console/middleware.rb:135:in `call_app'
web-console (3.7.0) lib/web_console/middleware.rb:22:in `block in call'
web-console (3.7.0) lib/web_console/middleware.rb:20:in `catch'
web-console (3.7.0) lib/web_console/middleware.rb:20:in `call'
actionpack (5.0.7.2) lib/action_dispatch/middleware/show_exceptions.rb:31:in `call'
railties (5.0.7.2) lib/rails/rack/logger.rb:36:in `call_app'
railties (5.0.7.2) lib/rails/rack/logger.rb:24:in `block in call'
activesupport (5.0.7.2) lib/active_support/tagged_logging.rb:69:in `block in tagged'
activesupport (5.0.7.2) lib/active_support/tagged_logging.rb:26:in `tagged'
activesupport (5.0.7.2) lib/active_support/tagged_logging.rb:69:in `tagged'
railties (5.0.7.2) lib/rails/rack/logger.rb:24:in `call'
sprockets-rails (3.2.1) lib/sprockets/rails/quiet_assets.rb:13:in `call'
actionpack (5.0.7.2) lib/action_dispatch/middleware/request_id.rb:24:in `call'
rack (2.2.3) lib/rack/method_override.rb:24:in `call'
rack (2.2.3) lib/rack/runtime.rb:22:in `call'
activesupport (5.0.7.2) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
actionpack (5.0.7.2) lib/action_dispatch/middleware/executor.rb:12:in `call'
actionpack (5.0.7.2) lib/action_dispatch/middleware/static.rb:136:in `call'
rack (2.2.3) lib/rack/sendfile.rb:110:in `call'
railties (5.0.7.2) lib/rails/engine.rb:522:in `call'
puma (3.12.6) lib/puma/configuration.rb:227:in `call'
puma (3.12.6) lib/puma/server.rb:706:in `handle_request'
puma (3.12.6) lib/puma/server.rb:476:in `process_client'
puma (3.12.6) lib/puma/server.rb:334:in `block in run'
puma (3.12.6) lib/puma/thread_pool.rb:135:in `block in spawn_thread'
This error occurred while loading the following files:
   active_record/base
Request
Parameters:

None
Toggle session dump
Toggle env dump
Response
Headers:

None

該当のソースコード

ターミナル上で、
$rails new test_app
$cd test__app
$bundle init
$bundle install
$rails s
という操作を行いました。

試したこと

bundle update をしてみましたが直りませんでした。

ご教授いただければ幸いです。

Comments

[gouf]

エラーメッセージのヒントは試してみましたか? : 「Specified 'sqlite3' for database adapter, but the gem is not loaded. Add `gem 'sqlite3'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord).」(Gemfile に sqlite3 の定義を追記して bundle install)

[gouf]

実施されたターミナルでの操作を、「bundle init」の手順を抜いて試した場合になにか変化は見られますか? (※すでに test_app は作成されているので、たとえば test_app2 を作成してみる)