Rails - Oct 2010 - no such file to load -- ZenTest but I have already installed ZenTest

$ rake spec cucumber --trace
(in /home/soroush/projects/mediapilot)
** Invoke spec (first_time)
** Invoke db:test:prepare (first_time)
** Invoke db:abort_if_pending_migrations (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute db:abort_if_pending_migrations
** Execute db:test:prepare
** Invoke db:test:load (first_time)
** Invoke db:test:purge (first_time)
** Invoke environment
** Execute db:test:purge
** Execute db:test:load
** Invoke db:schema:load (first_time)
** Invoke environment
** Execute db:schema:load
** Execute spec
/home/soroush/.gem/ruby/1.8/gems/rails-2.3.5/lib/rails/gem_dependency.rb:119:Warning:
Gem::Dependency#version_requirements is deprecated and will be removed
on or after August 2010.  Use #requirement
no such file to load -- ZenTest


Getting this problem when running rake spec cucumber. Problem is that
ZenTest gem is already installed :S

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