i have a problem in running following line

when i run the line:

ruby script/generate scaffold Item Manage

it displays a message
wrong number of arguments(1 for 2)

i am creating controller and model using
book 'Biggining Ruby on Rails' pg 167

kindly give suggestions!

If you type "ruby script/generate scaffold" without parametres it
display its help:

Usage: script/generate scaffold ModelName [field:type, field:type]

You must specify model name and table fields. Then run "rake
db:migration" and that's it!
I hope I help you.