Why doesn't the ruby ​​on rails server start?

Question

Ruby on Rails

When I write the "rails s" command, I get the error C:\Users\NamePC\Downloads\www\ssbb>rails
=> Booting Puma
=> Rails 5.1.7 application starting in development
=> Run `rails server -h` for more startup options
C:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/actionpack-5.1.7/lib/action_dispatch/midd
leware/stack.rb:35: warning: Using the last argument as keyword parameters is
deprecated; maybe ** should be added to the call
C:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/actionpack-5.1.7/lib/action_dispatch/midd
leware/static.rb:109: warning: The called method `initialize' is defined
here Check C:
/Users/Sex/Downloads/www/ssbb/tmp/pids/server.pid.
Exiting

Answer 1

A server is already running.

Most likely this is the case