New DEPRECATION warning - xml_serialization.rb

Hi,

I've been developing a RoR application for a couple of months now, and
haven't made any recent upgrades (Aptana RadRails in MyEclipse IDE).
All of a sudden, I'm getting the following warning messages:

c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/
xml_serialization.rb:278: warning: Object#type is deprecated; use
Object#class

I'd appreciate if someone could tip me on how to fix this. Thanks,

Chris.