`': superclass mismatch for class Server (TypeError)

Question

I have seen this and several others question, but their problems are not similar to mine.

I have added the following code to the config/boot.rb , to run

Answer 1

In Rails 5.2

in config/puma.rb I added this code.

#port        ENV.fetch("PORT") { 3000 }
bind        'tcp://0.0.0.0:3001'

And it works!