Qiitaなどで一通り確認した上でご質問します。  
5.0.0.1から5.2を導入時に、bootsnapを入れました。それによって、以下の状況が起きており、bootsnapを外すとbootsnapが無いと表示されます。

bootsnapのキャッシュもクリアしましたが無理でした。  
お知恵をおかしください。

```

    => Booting Puma
    => Rails 5.2.2 application starting in development 
    => Run `rails server -h` for more startup options
    Exiting
    Traceback (most recent call last):
        51: from bin/rails:4:in `<main>'
        50: from bin/rails:4:in `require'
        49: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/commands.rb:18:in `<top (required)>'
        48: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/command.rb:46:in `invoke'
        47: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/command/base.rb:65:in `perform'
        46: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/thor-0.20.3/lib/thor.rb:387:in `dispatch'
        45: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/thor-0.20.3/lib/thor/invocation.rb:126:in `invoke_command'
        44: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/thor-0.20.3/lib/thor/command.rb:27:in `run'
        43: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/commands/server/server_command.rb:142:in `perform'
        42: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/commands/server/server_command.rb:142:in `tap'
        41: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/commands/server/server_command.rb:147:in `block in perform'
        40: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/commands/server/server_command.rb:51:in `start'
        39: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/commands/server/server_command.rb:89:in `log_to_stdout'
        38: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/rack-2.0.6/lib/rack/server.rb:354:in `wrapped_app'
        37: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/commands/server/server_command.rb:27:in `app'
        36: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/rack-2.0.6/lib/rack/server.rb:219:in `app'
        35: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/rack-2.0.6/lib/rack/server.rb:319:in `build_app_and_options_from_config'
        34: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/rack-2.0.6/lib/rack/builder.rb:40:in `parse_file'
        33: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/rack-2.0.6/lib/rack/builder.rb:49:in `new_from_string'
        32: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/rack-2.0.6/lib/rack/builder.rb:49:in `eval'
        31: from config.ru:in `<main>'
        30: from config.ru:in `new'
        29: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/rack-2.0.6/lib/rack/builder.rb:55:in `initialize'
        28: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/rack-2.0.6/lib/rack/builder.rb:55:in `instance_eval'
        27: from config.ru:3:in `block in <main>'
        26: from config.ru:3:in `require_relative'
        25: from /Users/hogetaro/Documents/GitHub/fictapg/config/environment.rb:5:in `<top (required)>'
        24: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/application.rb:361:in `initialize!'
        23: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/initializable.rb:60:in `run_initializers'
        22: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/2.5.0/tsort.rb:205:in `tsort_each'
        21: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/2.5.0/tsort.rb:226:in `tsort_each'
        20: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/2.5.0/tsort.rb:347:in `each_strongly_connected_component'
        19: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/2.5.0/tsort.rb:347:in `call'
        18: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/2.5.0/tsort.rb:347:in `each'
        17: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/2.5.0/tsort.rb:349:in `block in each_strongly_connected_component'
        16: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/2.5.0/tsort.rb:431:in `each_strongly_connected_component_from'
        15: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/2.5.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component'
        14: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/2.5.0/tsort.rb:228:in `block in tsort_each'
        13: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/initializable.rb:61:in `block in run_initializers'
        12: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/initializable.rb:32:in `run'
        11: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/initializable.rb:32:in `instance_exec'
        10: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/devise-4.5.0/lib/devise/rails.rb:37:in `block in <class:Engine>'
         9: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/devise-4.5.0/lib/devise/secret_key_finder.rb:12:in `find'
         8: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/application.rb:399:in `secrets'
         7: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/secrets.rb:26:in `parse'
         6: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/secrets.rb:26:in `each_with_object'
         5: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/secrets.rb:26:in `each'
         4: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/secrets.rb:29:in `block in parse'
         3: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/2.5.0/erb.rb:876:in `result'
         2: from /Users/hogetaro/.rbenv/versions/2.5.3/lib/ruby/2.5.0/erb.rb:876:in `eval'
         1: from (erb):22:in `<main>'
    (erb):22:in `[]': no implicit conversion of Symbol into String (TypeError)
    
```
CC BY-SA 4.0
2018-12-24T11:40:59.867
51481
2018-12-24T11:40:59.867
question
ruby-on-rails
Rails5.0.0.1からRails5.2にアップグレードしたらPumaが立ち上がらない。