ruby-1.9.3-p448 / gems / acts_as_paranoid-0.3.1 / lib / acts_as_paranoid.rb:42:in"alias_method'

I am trying to use acts_as_paranoid gem, is already added in Gemfile (gem 'acts_as_paranoid') bundle updated and installed Installing acts_as_paranoid (0.3.1) but when I start my server I have the following error, any ideas? Thank you very much!I am trying to use acts_as_paranoid gem, is alr