rails bin/rails generate model rails aborted

i tried running this code,

rails bin/rails generate model Article title:string text:text

but am getting

rails aborted!
Don't know how to build task 'generate' (see --tasks)
bin/rails:4:in `require'
bin/rails:4:in `<main>'
(See full trace by running task with --trace)

I am following the blog documentation line by line and completely installed the ruby buy am still confused why it is not working

please i need help