capistrano and rails edge

hi,
I'm trying to capitranize my app (cap --apply-to app iEngine) but all
I got is a strange error:

/i386/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`gem_original_require': no such file to load -- app/config/environment
(LoadError)

what capistrano is talking about?

thanks.