Rails - Mar 2006 - scaffold and Migrations

After adding Migrations to my Rails app (they seem terrifc) when I run, say,

ruby script/generate scaffold City

I am getting a dependency model error "Another migration is already named
add_cities: db/migrate/001_add_cities.rb"

Model City is already in my app and when I run this scaffold generator
I''m
not intending to be touching any of the migration stuff.

What causing this error and what''s the fix?  Thanks.

Brian
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