problem about create project by aptana

After installed ruby 1.92 and rails 3.0.1 I can create project by windows cmd but when create project with aptana it perform conflict the pic i attached.Any one face this problem .Share idea please                                               best                                                Tanawat

Attachments: http://www.ruby-forum.com/attachment/5235/railsconflicct.png

Please show what "details" contains, as from the error message this has nothing to with Ruby, Rails or Ruby for Windows.