「rails s」がうまくいきません。。

ターミナルにて「rails s」としたところ、
下のようになってしまいました。
どうすれば解決できるでしょうか？

cloud9user:~/environment/myapp (master) $ rails s
=> Booting Puma
=> Rails 5.2.3 application starting in development 
=> Run `rails server -h` for more startup options
Puma starting in single mode...
* Version 3.12.1 (ruby 2.6.3-p62), codename: Llamas in Pajamas
* Min threads: 5, max threads: 5
* Environment: development
Exiting
Traceback (most recent call last):
        43: from bin/rails:3:in `<main>'
        42: from bin/rails:3:in `load'
        41: from /home/ec2-user/environment/myapp/bin/spring:15:in `<top (required)>'
        40: from /home/ec2-user/environment/myapp/bin/spring:15:in `require'
        39: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/lib/spring/binstub.rb:11:in `<top (required)>'
        38: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/lib/spring/binstub.rb:11:in `load'
        37: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/bin/spring:49:in `<top (required)>'
        36: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/lib/spring/client.rb:30:in `run'
        35: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/lib/spring/client/command.rb:7:in `call'
        34: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/lib/spring/client/rails.rb:28:in `call'
        33: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/lib/spring/client/rails.rb:28:in `load'
        32: from /home/ec2-user/environment/myapp/bin/rails:9:in `<top (required)>'
        31: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:291:in `require'
        30: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:257:in `load_dependency'
        29: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:291:in `block in require'
        28: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
        27: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require_with_bootsnap_lfi'
        26: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.4/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
        25: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `block in require_with_bootsnap_lfi'
        24: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require'
        23: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/railties-5.2.3/lib/rails/commands.rb:18:in `<main>'
        22: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/railties-5.2.3/lib/rails/command.rb:46:in `invoke'
        21: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/railties-5.2.3/lib/rails/command/base.rb:65:in `perform'
        20: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/thor-0.20.3/lib/thor.rb:387:in `dispatch'
        19: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/thor-0.20.3/lib/thor/invocation.rb:126:in `invoke_command'
        18: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/thor-0.20.3/lib/thor/command.rb:27:in `run'
        17: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/railties-5.2.3/lib/rails/commands/server/server_command.rb:142:in `perform'
        16: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/railties-5.2.3/lib/rails/commands/server/server_command.rb:142:in `tap'
        15: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/railties-5.2.3/lib/rails/commands/server/server_command.rb:147:in `block in perform'
        14: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/railties-5.2.3/lib/rails/commands/server/server_command.rb:53:in `start'
        13: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/rack-2.0.7/lib/rack/server.rb:297:in `start'
        12: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/puma-3.12.1/lib/rack/handler/puma.rb:73:in `run'
        11: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/puma-3.12.1/lib/puma/launcher.rb:186:in `run'
        10: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/puma-3.12.1/lib/puma/single.rb:98:in `run'
         9: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/puma-3.12.1/lib/puma/runner.rb:153:in `load_and_bind'
         8: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/puma-3.12.1/lib/puma/binder.rb:90:in `parse'
         7: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/puma-3.12.1/lib/puma/binder.rb:90:in `each'
         6: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/puma-3.12.1/lib/puma/binder.rb:106:in `block in parse'
         5: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/puma-3.12.1/lib/puma/binder.rb:266:in `add_tcp_listener'
         4: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/puma-3.12.1/lib/puma/binder.rb:266:in `each'
         3: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/puma-3.12.1/lib/puma/binder.rb:267:in `block in add_tcp_listener'
         2: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/puma-3.12.1/lib/puma/binder.rb:273:in `add_tcp_listener'
         1: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/puma-3.12.1/lib/puma/binder.rb:273:in `new'
/home/ec2-user/.rvm/gems/ruby-2.6.3/gems/puma-3.12.1/lib/puma/binder.rb:273:in `initialize': Address already in use - bind(2) for "127.0.0.1" port 8080 (Errno::EADDRINUSE)
cloud9user:~/environment/myapp (master) $