problem: debug in netbeans 7.1

Hi,

In the moment i want to debugger my aplication appear the following
message:

Could not connect with de web server...

and de log is the following:

Try dropping back to NetBeans 6.9.1. Rails is not supported in
NetBeans 7.

See:
http://wiki.netbeans.org/RubySupport
http://www.infoworld.com/d/developer-world/netbeans-ide-drops-ruby-rails-backing-674