[Rails] Recaptcha plugin problem

Hi all, I am using radiant CMS and I am trying to create custom extension and add recaptcha validation to it but when I call if not verify_recaptcha(:private_key => 'aaa') #add error end I get: undefined method `verify_recaptcha' for # Bellow is the full code for my model clas

[Rails] rake spec error: uninitialized constant Spec::Rails::Example::RailsExampleGroup

-0.7.1/vendor/rails/activerecord/ lib/../../activesupport/lib/active_support/depend encies.rb:276:in `load_missing_constant': uninitialized constant Spec::Rails::Example::RailsExampleGroup (NameError) If someone have faced this before and have solutions please help. 10x in advance