scaffold not generating _form.rhtlml.erb fiel in app/view

I'm learning about Ruby on Rails. Please help me. Althougth I do step-by-step with books(config data, generate model, add data field in db/migrate/file.rb) but i can't generate with scaffold or error. When run command: ruby script\generate scaffold Employee And check: http://127.0.0.1:3000/employees/ --> it shows successful with show,edit,destroy however it can't show data field although i inserted data in mysql. It shows: