[Radiant] Newbie to Radiant, rake issue after installing

[FFabrizi]

Hi All, 

New to ruby/rails & radiant

system: debian 6
ruby: 1.9.2p290
rails: 3.1.3

The issue comes up after I cd into my project folder after creating it 
and running the following:
rake db:bootstrap

I get the following error:

'rake/rdoctask is deprecated. Use rdoc/task instead (in RDoc 2.4.2+)'

So I searched around on the net and found I had to change my Rakefile:

require 'rake/clean'
require 'rake/testtask'
#Added the below line on 30/11/2011 to try to fix the 
#'rake/rdoctask is deprecated...'
require 'rdoc/task'

But I still get the same message. 
Where am I going wrong?

Thanks

Fabs