お世話になっております。十河と申します。

rakeを使ってdb:migrateしているのですが、no such file to  
load -- aceというエラーが出てしまい困っています。
検索してみたのですが対策見つかりませんでした。お分かりになる方お 
られましたらアドバイスいただけないでしょうか。
よろしくおねがいいたします。


rake db:migrate -trace
rake aborted!
no such file to load -- ace
/opt/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in  
`gem_original_require'
/opt/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in  
`require'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1864:in  
`do_option'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1900:in  
`handle_options'
/opt/local/lib/ruby/1.8/getoptlong.rb:613:in `each'
/opt/local/lib/ruby/1.8/getoptlong.rb:610:in `loop'
/opt/local/lib/ruby/1.8/getoptlong.rb:610:in `each'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1900:in  
`handle_options'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1719:in `init'
/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:1717:in `init'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1709: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

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