Rails g migration doesn't work

Question

When I run the command

rails g migration migration_name

I will get the \"error\" message:

Usage:
  rails new APP         


        

Answer 1

You are not running it inside a rails generated project directory. You are running it outside it.

EDIT: It could also be if the script folder is missing. Or the rails script is missing inside the script folder if you are executing it inside the project folder.