relative_path_from error

Hello, i tried to run the command

ruby script/generate scaffold Item Manage

, but i got the following error:

ruby script/generate scaffold Item Manage

D:/eclipseSE/eclipse/plugins/org.jruby_1.1.6.8388p3/lib/ruby/1.8/pathname.rb:712:in `relative_path_from': different prefix: "C:/" and "C:\\Documents and Settings/admin/workspace/store" (ArgumentError)   from D:/eclipseSE/eclipse/plugins/org.jruby_1.1.6.8388p3/lib/ruby/gems/1.8/gems/rails-2.2.2/lib/rails_generator/lookup.rb:110:in `use_component_sources!'   from D:/eclipseSE/eclipse/plugins/org.jruby_1.1.6.8388p3/lib/ruby/gems/1.8/gems/rails-2.2.2/lib/rails_generator/lookup.rb:109:in `each'

I really don't know what's wrong, or what should i do to solve thie problem. Please help me.. I'm using Aptana Radrails plugin in Eclipse 3.4.1 Thanks