rake db:migrate with rbx

➜  pftf git:(master) ✗ rake db:migrate --trace
(in /Users/santiago/WyeWorks/Projs/pftf)
rake aborted!
Could not find root path for Devise::Engine
/Users/santiago/.rvm/gems/rbx-1.1.0-20100923/gems/railties-3.0.1/lib/rails/engine.rb:120:in `find_root_with_flag'
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/Users/santiago/.rvm/gems/rbx-1.1.0-20100923/bundler/gems/devise-cdbd03c45a5b/lib/devise/rails.rb:5:in `__module_init__ (Devise)'
/Users/santiago/.rvm/gems/rbx-1.1.0-20100923/bundler/gems/devise-cdbd03c45a5b/lib/devise/rails.rb:4:in `__script__'
kernel/common/codeloader.rb:145:in `require'
kernel/common/kernel.rb:707:in `require'
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/Users/santiago/.rvm/gems/rbx-1.1.0-20100923/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:225:in `load_dependency'
/Users/santiago/.rvm/gems/rbx-1.1.0-20100923/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:591:in `new_constants_in'
/Users/santiago/.rvm/gems/rbx-1.1.0-20100923/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:225:in `load_dependency'
/Users/santiago/.rvm/gems/rbx-1.1.0-20100923/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:239:in `require'
/Users/santiago/.rvm/gems/rbx-1.1.0-20100923/bundler/gems/devise-cdbd03c45a5b/lib/devise.rb:372:in `__script__'
kernel/common/codeloader.rb:145:in `require'
kernel/common/kernel.rb:707:in `require'
/Users/santiago/.rvm/gems/rbx-1.1.0-20100923@global/gems/bundler-1.0.2/lib/bundler/runtime.rb:64:in `require'
kernel/bootstrap/array.rb:66:in `each'
/Users/santiago/.rvm/gems/rbx-1.1.0-20100923@global/gems/bundler-1.0.2/lib/bundler/runtime.rb:62:in `require'
kernel/bootstrap/array.rb:66:in `each'
/Users/santiago/.rvm/gems/rbx-1.1.0-20100923@global/gems/bundler-1.0.2/lib/bundler/runtime.rb:51:in `require'
/Users/santiago/.rvm/gems/rbx-1.1.0-20100923@global/gems/bundler-1.0.2/lib/bundler.rb:112:in `require'
/Users/santiago/WyeWorks/Projs/pftf/config/application.rb:7:in `__script__'
kernel/common/codeloader.rb:145:in `require'
kernel/common/kernel.rb:707:in `gem_original_require (require)'
/Users/santiago/.rvm/rubies/rbx-1.1.0-20100923/lib/rubygems/custom_require.rb:31:in `require'
/Users/santiago/WyeWorks/Projs/pftf/Rakefile:4:in `__script__'
kernel/common/kernel.rb:656:in `load'
/Users/santiago/.rvm/gems/rbx-1.1.0-20100923/gems/rake-0.8.7/lib/rake.rb:2383:in `raw_load_rakefile'
/Users/santiago/.rvm/gems/rbx-1.1.0-20100923/gems/rake-0.8.7/lib/rake.rb:2017:in `load_rakefile'
/Users/santiago/.rvm/gems/rbx-1.1.0-20100923/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/Users/santiago/.rvm/gems/rbx-1.1.0-20100923/gems/rake-0.8.7/lib/rake.rb:2016:in `load_rakefile'
/Users/santiago/.rvm/gems/rbx-1.1.0-20100923/gems/rake-0.8.7/lib/rake.rb:2000:in `run'
/Users/santiago/.rvm/gems/rbx-1.1.0-20100923/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/Users/santiago/.rvm/gems/rbx-1.1.0-20100923/gems/rake-0.8.7/lib/rake.rb:1998:in `run'
/Users/santiago/.rvm/gems/rbx-1.1.0-20100923/gems/rake-0.8.7/bin/rake:31:in `__script__'
kernel/common/kernel.rb:656:in `load'
/Users/santiago/.rvm/gems/rbx-1.1.0-20100923/bin/rake:19:in `__script__'
kernel/delta/codeloader.rb:67:in `load_script'
kernel/delta/codeloader.rb:91:in `load_script'
kernel/loader.rb:460:in `script'
kernel/loader.rb:571:in `main'
kernel/loader.rb:609:in `main'
kernel/loader.rb:621:in `__script__'