Rails5へアップグレード後の (URI::InvalidURIError)を解決できません。

Question

###前提・実現したいこと
ローカルサーバーを起動したいです。

###発生している問題・エラーメッセージ

cloud9でローカルサーバーを起動すると、以下のようなエラーが発生します。
ディレクトリすら見つけられず困ってます。。。

/usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/uri/rfc3986_parser.rb:18:in `rescue in split': bad URI(is not URI?):  (URI::InvalidURIError)

###該当のソースコード

/usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/uri/rfc3986_parser.rb:18:in `rescue in split': bad URI(is not URI?):  (URI::InvalidURIError)
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/uri/rfc3986_parser.rb:15:in `split'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/uri/rfc3986_parser.rb:73:in `parse'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/uri/common.rb:227:in `parse'
        from /home/ubuntu/workspace/config/initializers/redis.rb:3:in `<top (required)>'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-5.0.0/lib/active_support/dependencies.rb:287:in `load'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-5.0.0/lib/active_support/dependencies.rb:287:in `block in load'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-5.0.0/lib/active_support/dependencies.rb:259:in `load_dependency'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-5.0.0/lib/active_support/dependencies.rb:287:in `load'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/engine.rb:648:in `block in load_config_initializer'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-5.0.0/lib/active_support/notifications.rb:166:in `instrument'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/engine.rb:647:in `load_config_initializer'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/engine.rb:612:in `block (2 levels) in <class:Engine>'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/engine.rb:611:in `each'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/engine.rb:611:in `block in <class:Engine>'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/initializable.rb:30:in `instance_exec'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/initializable.rb:30:in `run'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/initializable.rb:55:in `block in run_initializers'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:228:in `block in tsort_each'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:422:in `block (2 levels) in each_strongly_connected_component_from'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:422:in `block (2 levels) in each_strongly_connected_component_from'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:422:in `block (2 levels) in each_strongly_connected_component_from'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:431:in `each_strongly_connected_component_from'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:421:in `block in each_strongly_connected_component_from'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/initializable.rb:44:in `each'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/initializable.rb:44:in `tsort_each_child'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:415:in `call'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:415:in `each_strongly_connected_component_from'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:421:in `block in each_strongly_connected_component_from'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/initializable.rb:44:in `each'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/initializable.rb:44:in `tsort_each_child'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:415:in `call'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:415:in `each_strongly_connected_component_from'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:421:in `block in each_strongly_connected_component_from'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/initializable.rb:44:in `each'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/initializable.rb:44:in `tsort_each_child'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:415:in `call'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:415:in `each_strongly_connected_component_from'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:349:in `block in each_strongly_connected_component'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:347:in `each'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:347:in `call'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:347:in `each_strongly_connected_component'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:226:in `tsort_each'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:205:in `tsort_each'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/initializable.rb:54:in `run_initializers'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/application.rb:352:in `initialize!'
        from /home/ubuntu/workspace/config/environment.rb:5:in `<top (required)>'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-5.0.0/lib/active_support/dependencies.rb:293:in `require'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-5.0.0/lib/active_support/dependencies.rb:293:in `block in require'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-5.0.0/lib/active_support/dependencies.rb:259:in `load_dependency'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-5.0.0/lib/active_support/dependencies.rb:293:in `require'
        from /home/ubuntu/workspace/config.ru:3:in `block in <main>'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/rack-2.0.1/lib/rack/builder.rb:55:in `instance_eval'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/rack-2.0.1/lib/rack/builder.rb:55:in `initialize'
        from /home/ubuntu/workspace/config.ru:in `new'
        from /home/ubuntu/workspace/config.ru:in `<main>'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/rack-2.0.1/lib/rack/builder.rb:49:in `eval'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/rack-2.0.1/lib/rack/builder.rb:49:in `new_from_string'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/rack-2.0.1/lib/rack/builder.rb:40:in `parse_file'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/rack-2.0.1/lib/rack/server.rb:318:in `build_app_and_options_from_config'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/rack-2.0.1/lib/rack/server.rb:218:in `app'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/commands/server.rb:59:in `app'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/rack-2.0.1/lib/rack/server.rb:353:in `wrapped_app'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/commands/server.rb:124:in `log_to_stdout'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/commands/server.rb:77:in `start'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/commands/commands_tasks.rb:90:in `block in server'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/commands/commands_tasks.rb:85:in `tap'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/commands/commands_tasks.rb:85:in `server'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/commands/commands_tasks.rb:49:in `run_command!'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/commands.rb:18:in `<top (required)>'
        from bin/rails:4:in `require'
        from bin/rails:4:in `<main>'

videoや画像などのurlがかんけいしているのでしょうか？

###追加

rails db:migrateをすると同様のエラーが起きます。
エラー内容に

/home/ubuntu/workspace/config/initializers/redis.rb:3:in `<top (required)>'

というものがありました。
このファイルは以下のようになっています。

【redis.rb】

require 'redis'

uri = URI.parse(ENV["REDIS"])
REDIS = Redis.new(host: uri.host, port: uri.port)★★

このURLが原因でしょうか？

Answer 1

redisが原因でした。

【redis.rb】before

    require 'redis'
    
    uri = URI.parse(ENV["REDIS"])
    REDIS = Redis.new(host: uri.host, port: uri.port)

【redis.rb】after

if ENV["REDIS"]
    require 'redis'
    
    uri = URI.parse(ENV["REDIS"])
    REDIS = Redis.new(host: uri.host, port: uri.port)
end

でこのエラーは解決しました。
また次のエラーが現れたのですが(*´Д｀)

ただ、これだとredisが使えなくなってしまいます…

参考