はじめまして。
もしお分かりの方がいらっしゃいましらアドバイスいただけますでしょうか。

【したいこと】
Bitnami Redmine に Easy Gantt(free)プラグインをいれたい

【問題】
プラグインを入れてアプリケーションを起動させると「Your application is not available」と表示される

【環境,インストールバージョン等】
Windows 10 64bit
Bitnami Redmine Stack 3.3.1-0
- Redmine 3.3.1
- Apache 2.4.23
- ImageMagick 6.7.5
- MySQL 5.6.33
- Subversion 1.9.4
- Git 2.7.4
- Ruby 2.1.10
- Rails 4.2.5.1
- RubyGems 1.8.12
Easy Gantt(free) 2016/12/9にダウンロードしたもの

【知識レベル】
先日Redmineを触り始めたところ
Ruby、mySQLの知識ゼロ

【作業内容】
1. Bitnamiのサイトから「bitnami-redmine-3.3.1-0-windows-installer.exe」をダウンロードして「C:\Bitnami\redmine」フォルダにインストール
2. アプリケーションを起動し、ログイン→管理→設定→RESTによるWebサービスを有効にするにチェック
3. https://www.easyredmine.com/redmine-gantt-pluginから「EasyGanttFree.zip」をダウンロードして解凍後の「easy-gantt」フォルダを「C:\Bitnami\redmine\apps\redmine\htdocs\plugins」フォルダに格納
<以下、EasyGantt公式サイトのインストール手順どおりにコマンドを実行>
https://www.easyredmine.com/redmine-gantt-plugin
4. Bitnami Redmine Stackのコマンド画面を開き、以下コマンドを入力して実行

C:\Bitnami\redmine\apps\redmine\htdocs>bundle install You are trying
to install in deployment mode after changing your Gemfile. Run `bundle
install` elsewhere and add the updated Gemfile.lock to version
control.

If this is a development machine, remove the Gemfile freeze by running
`bundle install --no-deployment`.

You have added to the Gemfile:
* redmine_extensions

C:\Bitnami\redmine\apps\redmine\htdocs>bundle exec rake db:migrate
RAILS_ENV=production DL is deprecated, please use Fiddle rake aborted!
NameError: uninitialized constant RedmineExtensions
C:/Bitnami/redmine/apps/redmine/htdocs/plugins/easy_gantt/lib/easy_gantt/redmine_patch/helpers/application_helper_patch.rb:26:in
`<top (required)>'
C:/Bitnami/redmine/apps/redmine/htdocs/plugins/easy_gantt/after_init.rb:8:in
`block in <top (required)>'
C:/Bitnami/redmine/apps/redmine/htdocs/plugins/easy_gantt/after_init.rb:7:in
`each'
C:/Bitnami/redmine/apps/redmine/htdocs/plugins/easy_gantt/after_init.rb:7:in
`<top (required)>'
C:/Bitnami/redmine/apps/redmine/htdocs/plugins/easy_gantt/init.rb:22:in
`require_relative'
C:/Bitnami/redmine/apps/redmine/htdocs/plugins/easy_gantt/init.rb:22:in
`<top (required)>'
C:/Bitnami/redmine/apps/redmine/htdocs/lib/redmine/plugin.rb:155:in
`block in load'
C:/Bitnami/redmine/apps/redmine/htdocs/lib/redmine/plugin.rb:146:in
`each'
C:/Bitnami/redmine/apps/redmine/htdocs/lib/redmine/plugin.rb:146:in
`load'
C:/Bitnami/redmine/apps/redmine/htdocs/config/initializers/30-redmine.rb:21:in
`<top (required)>'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/engine.rb:652:in
`block in load_config_initializer'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.7.1/lib/active_support/notifications.rb:166:in
`instrument'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/engine.rb:651:in
`load_config_initializer'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/engine.rb:616:in
`block (2 levels) in <class:Engine>'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/engine.rb:615:in
`each'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/engine.rb:615:in
`block in <class:Engine>'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/initializable.rb:30:in
`instance_exec'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/initializable.rb:30:in
`run'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/initializable.rb:55:in
`block in run_initializers'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/initializable.rb:44:in
`each'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/initializable.rb:44:in
`tsort_each_child'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/initializable.rb:54:in
`run_initializers'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/application.rb:352:in
`initialize!'
C:/Bitnami/redmine/apps/redmine/htdocs/config/environment.rb:14:in
`<top (required)>'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/application.rb:328:in
`require_environment!'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/application.rb:457:in
`block in run_tasks_blocks'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/rake-11.3.0/exe/rake:27:in
`<top (required)>' Tasks: TOP => db:migrate => environment (See full
trace by running task with --trace)

C:\Bitnami\redmine\apps\redmine\htdocs>bundle exec rake
redmine:plugins:migrate RAILS_ENV=production DL is deprecated, please
use Fiddle rake aborted! NameError: uninitialized constant
RedmineExtensions
C:/Bitnami/redmine/apps/redmine/htdocs/plugins/easy_gantt/lib/easy_gantt/redmine_patch/helpers/application_helper_patch.rb:26:in
`<top (required)>'
C:/Bitnami/redmine/apps/redmine/htdocs/plugins/easy_gantt/after_init.rb:8:in
`block in <top (required)>'
C:/Bitnami/redmine/apps/redmine/htdocs/plugins/easy_gantt/after_init.rb:7:in
`each'
C:/Bitnami/redmine/apps/redmine/htdocs/plugins/easy_gantt/after_init.rb:7:in
`<top (required)>'
C:/Bitnami/redmine/apps/redmine/htdocs/plugins/easy_gantt/init.rb:22:in
`require_relative'
C:/Bitnami/redmine/apps/redmine/htdocs/plugins/easy_gantt/init.rb:22:in
`<top (required)>'
C:/Bitnami/redmine/apps/redmine/htdocs/lib/redmine/plugin.rb:155:in
`block in load'
C:/Bitnami/redmine/apps/redmine/htdocs/lib/redmine/plugin.rb:146:in
`each'
C:/Bitnami/redmine/apps/redmine/htdocs/lib/redmine/plugin.rb:146:in
`load'
C:/Bitnami/redmine/apps/redmine/htdocs/config/initializers/30-redmine.rb:21:in
`<top (required)>'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/engine.rb:652:in
`block in load_config_initializer'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.7.1/lib/active_support/notifications.rb:166:in
`instrument'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/engine.rb:651:in
`load_config_initializer'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/engine.rb:616:in
`block (2 levels) in <class:Engine>'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/engine.rb:615:in
`each'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/engine.rb:615:in
`block in <class:Engine>'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/initializable.rb:30:in
`instance_exec'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/initializable.rb:30:in
`run'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/initializable.rb:55:in
`block in run_initializers'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/initializable.rb:44:in
`each'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/initializable.rb:44:in
`tsort_each_child'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/initializable.rb:54:in
`run_initializers'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/application.rb:352:in
`initialize!'
C:/Bitnami/redmine/apps/redmine/htdocs/config/environment.rb:14:in
`<top (required)>'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/application.rb:328:in
`require_environment!'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/railties-4.2.7.1/lib/rails/application.rb:457:in
`block in run_tasks_blocks'
C:/Bitnami/redmine/apps/redmine/htdocs/vendor/bundle/ruby/2.1.0/gems/rake-11.3.0/exe/rake:27:in
`<top (required)>' Tasks: TOP => redmine:plugins:migrate =>
environment (See full trace by running task with --trace)

5.Manager Tool の Manage Servers で Reset All　→　Thin_redmineとThin_redmine2がStoppedになり、アプリケーションを起動しても「Your application is not available」となる