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: