`method_missing': undefined method `devise' for User (call 'User.connection' to establish a connection)

Question

I am new to Ruby on Rails and am trying to make my first application. I am having issues though anytime I run any rails generate command. I get the following er

Answer 1

This happens because you missed the command:

rails generate devise:install

You need just comment all devise lines temporally (in routes.rb / user.rb) to not get raise.
And run command again.