[RUBY] Remedy for "A server is already running." Error when running rails s

When I try to start rails s, I get an error like this ...

$ rails s -b
=> Booting Puma
=> Rails application starting in development 
=> Run `rails server -h` for more startup options
A server is already running. Check /Directory path/tmp/pids/server.pid.

This is an error that occurs because the server is already running.

Kill the PID of server.pid

Execute the following command.

$ lsof -i:3000
ruby2.5 3033 vagrant   16u  IPv4  27499      0t0  TCP *:3000 (LISTEN)

Delete the above PID value with the following value.

$ kill -9 3033

This will solve it.

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