getting rake abort when doing rake rails:freeze

hi
i try to freeze rails and getting this error.
crankky:~/rails/dev/autopolishine/trunk/vendor LaiChanHuai$ rake
rails:freeze --trace
(in /Users/LaiChanHuai/rails/dev/autopolishine/trunk)
rake aborted!
Don't know how to build task 'rails:freeze'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1472:in `[]'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1739:in
`top_level'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1739:in
`each'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1739:in
`top_level'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1761:in
`standard_exception_handling'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1733:in
`top_level'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1711:in `run'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1761:in
`standard_exception_handling'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1708:in `run'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.7.3/bin/rake:7
/opt/local/bin/rake:16:in `load'
/opt/local/bin/rake:16

any advice?

hi thanks
this help =)