Rake コマンドで already initialized constant FileUtils::RUBY

# rake コマンドで下記エラー

👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇

```
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/file_utils.rb:10: warning: already initialized constant FileUtils::RUBY
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/file_utils.rb:10: warning: previous definition of RUBY was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/file_utils.rb:109: warning: already initialized constant FileUtils::LN_SUPPORTED
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/file_utils.rb:109: warning: previous definition of LN_SUPPORTED was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/file_utils_ext.rb:17: warning: already initialized constant Rake::FileUtilsExt::DEFAULT
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/file_utils_ext.rb:17: warning: previous definition of DEFAULT was here
WARNING: Possible conflict with Rake extension: String#ext already exists
WARNING: Possible conflict with Rake extension: String#pathmap already exists
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/file_list.rb:44: warning: already initialized constant Rake::FileList::ARRAY_METHODS
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/file_list.rb:44: warning: previous definition of ARRAY_METHODS was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/file_list.rb:47: warning: already initialized constant Rake::FileList::MUST_DEFINE
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/file_list.rb:47: warning: previous definition of MUST_DEFINE was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/file_list.rb:51: warning: already initialized constant Rake::FileList::MUST_NOT_DEFINE
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/file_list.rb:51: warning: previous definition of MUST_NOT_DEFINE was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/file_list.rb:55: warning: already initialized constant Rake::FileList::SPECIAL_RETURN
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/file_list.rb:55: warning: previous definition of SPECIAL_RETURN was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/file_list.rb:61: warning: already initialized constant Rake::FileList::DELEGATING_METHODS
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/file_list.rb:61: warning: previous definition of DELEGATING_METHODS was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/file_list.rb:86: warning: already initialized constant Rake::FileList::GLOB_PATTERN
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/file_list.rb:86: warning: previous definition of GLOB_PATTERN was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/file_list.rb:381: warning: already initialized constant Rake::FileList::DEFAULT_IGNORE_PATTERNS
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/file_list.rb:381: warning: previous definition of DEFAULT_IGNORE_PATTERNS was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/file_list.rb:387: warning: already initialized constant Rake::FileList::DEFAULT_IGNORE_PROCS
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/file_list.rb:387: warning: previous definition of DEFAULT_IGNORE_PROCS was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/version.rb:3: warning: already initialized constant Rake::VERSION
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/version.rb:3: warning: previous definition of VERSION was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/version.rb:6: warning: already initialized constant Rake::Version::MAJOR
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/version.rb:6: warning: previous definition of MAJOR was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/version.rb:6: warning: already initialized constant Rake::Version::MINOR
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/version.rb:6: warning: previous definition of MINOR was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/version.rb:6: warning: already initialized constant Rake::Version::BUILD
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/version.rb:6: warning: previous definition of BUILD was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/version.rb:6: warning: already initialized constant Rake::Version::OTHER
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/version.rb:6: warning: previous definition of OTHER was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/version.rb:8: warning: already initialized constant Rake::Version::NUMBERS
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/version.rb:8: warning: previous definition of NUMBERS was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/linked_list.rb:110: warning: already initialized constant Rake::LinkedList::EMPTY
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/linked_list.rb:110: warning: previous definition of EMPTY was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/scope.rb:41: warning: already initialized constant Rake::Scope::EMPTY
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/scope.rb:41: warning: previous definition of EMPTY was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/promise.rb:12: warning: already initialized constant Rake::Promise::NOT_SET
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/promise.rb:12: warning: previous definition of NOT_SET was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/application.rb:13: warning: already initialized constant Rake::CommandLineOptionError
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/application.rb:13: warning: previous definition of CommandLineOptionError was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/application.rb:41: warning: already initialized constant Rake::Application::DEFAULT_RAKEFILES
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/application.rb:41: warning: previous definition of DEFAULT_RAKEFILES was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/task_arguments.rb:108: warning: already initialized constant Rake::EMPTY_TASK_ARGS
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/task_arguments.rb:108: warning: previous definition of EMPTY_TASK_ARGS was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/invocation_chain.rb:55: warning: already initialized constant Rake::InvocationChain::EMPTY
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/invocation_chain.rb:55: warning: previous definition of EMPTY was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/early_time.rb:21: warning: already initialized constant Rake::EARLY
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/early_time.rb:21: warning: previous definition of EARLY was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/late_time.rb:17: warning: already initialized constant Rake::LATE
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/late_time.rb:17: warning: previous definition of LATE was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/backtrace.rb:4: warning: already initialized constant Rake::Backtrace::SYS_KEYS
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/backtrace.rb:4: warning: previous definition of SYS_KEYS was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/backtrace.rb:5: warning: already initialized constant Rake::Backtrace::SYS_PATHS
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/backtrace.rb:5: warning: previous definition of SYS_PATHS was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/backtrace.rb:8: warning: already initialized constant Rake::Backtrace::SUPPRESSED_PATHS
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/backtrace.rb:8: warning: previous definition of SUPPRESSED_PATHS was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/backtrace.rb:12: warning: already initialized constant Rake::Backtrace::SUPPRESSED_PATHS_RE
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/backtrace.rb:12: warning: previous definition of SUPPRESSED_PATHS_RE was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake/backtrace.rb:16: warning: already initialized constant Rake::Backtrace::SUPPRESS_PATTERN
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake/backtrace.rb:16: warning: previous definition of SUPPRESS_PATTERN was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake.rb:70: warning: already initialized constant FileList
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake.rb:70: warning: previous definition of FileList was here
/usr/share/nginx/html/vendor/bundle/ruby/2.2.0/gems/rake-12.3.0/lib/rake.rb:71: warning: already initialized constant RakeFileUtils
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-12.3.0/lib/rake.rb:71: warning: previous definition of RakeFileUtils was here
```

## 原因

rbenvを使ってrubyをインストールしましたが、

下記を実行したため

```
bundle install --path ./vendor/bundle/
```

このため、vendor/bundleのgem、rbenvでインストールした、rubyの中のgemが一緒に走りこんな長いエラー、
既に動いてるぜ的な感じ、
なので、

rails project の ./vendor/bundleを削除し、./bundle/configの参照先パスをコメントアウトし、rbenv内のgem達のみを、みに行くようにします。

## 手順

```
cd /rails/project_root/
rm -rf vendor/bundle
bundle install
vi .bundle/config

BUNDLE_PATH: "./vendor/bundle/" <!-- こうなっているものを下記のようにします。-->
<!-- BUNDLE_PATH: "./vendor/bundle/" -->　
```

上記で完了

## 確認

```
rake -T
rake about                              # List versions of all Rails frameworks and the environment
rake app:template                       # Applies the template supplied by LOCATION=(/path/to/template) or URL
rake app:update                         # Update configs and some other initially generated files (or use just update:configs or update:bin)
rake assets:clean[keep]                 # Remove old compiled assets
rake assets:clobber                     # Remove compiled assets
rake assets:environment                 # Load asset compile environment
rake assets:precompile                  # Compile all the assets named in config.assets.precompile
rake cache_digests:dependencies         # Lookup first-level dependencies for TEMPLATE (like messages/show or comments/_comment.html)
rake cache_digests:nested_dependencies  # Lookup nested dependencies for TEMPLATE (like messages/show or comments/_comment.html)
rake db:create                          # Creates the database from DATABASE_URL or config/database.yml for the current RAILS_ENV (use db:create:all ...
rake db:drop                            # Drops the database from DATABASE_URL or config/database.yml for the current RAILS_ENV (use db:drop:all to d...
rake db:environment:set                 # Set the environment value for the database
rake db:fixtures:load                   # Loads fixtures into the current environment's database
rake db:migrate                         # Migrate the database (options: VERSION=x, VERBOSE=false, SCOPE=blog)
rake db:migrate:status                  # Display status of migrations
rake db:rollback                        # Rolls the schema back to the previous version (specify steps w/ STEP=n)
rake db:schema:cache:clear              # Clears a db/schema_cache.dump file
rake db:schema:cache:dump               # Creates a db/schema_cache.dump file
rake db:schema:dump                     # Creates a db/schema.rb file that is portable against any DB supported by Active Record
rake db:schema:load                     # Loads a schema.rb file into the database
rake db:seed                            # Loads the seed data from db/seeds.rb
rake db:setup                           # Creates the database, loads the schema, and initializes with the seed data (use db:reset to also drop the d...
rake db:structure:dump                  # Dumps the database structure to db/structure.sql
rake db:structure:load                  # Recreates the databases from the structure.sql file
rake db:version                         # Retrieves the current schema version number
rake dev:cache                          # Toggle development mode caching on/off
rake initializers                       # Print out all defined initializers in the order they are invoked by Rails
rake log:clear                          # Truncates all/specified *.log files in log/ to zero bytes (specify which logs with LOGS=test,development)
rake middleware                         # Prints out your Rack middleware stack
rake notes                              # Enumerate all annotations (use notes:optimize, :fixme, :todo for focus)
rake notes:custom                       # Enumerate a custom annotation, specify with ANNOTATION=CUSTOM
rake restart                            # Restart app by touching tmp/restart.txt
rake routes                             # Print out all defined routes in match order, with names
rake secret                             # Generate a cryptographically secure secret key (this is typically used to generate a secret for cookie sess...
rake stats                              # Report code statistics (KLOCs, etc) from the application or engine
rake test                               # Runs all tests in test folder
rake test:db                            # Run tests quickly, but also reset db
rake time:zones[country_or_offset]      # List all time zones, list by two-letter country code (`rails time:zones[US]`), or list by UTC offset (`rail...
rake tmp:clear                          # Clear cache and socket files from tmp/ (narrow w/ tmp:cache:clear, tmp:sockets:clear)
rake tmp:create                         # Creates tmp directories for cache, sockets, and pids

```

完了です。