Activatable module not available

[simmogs]

Hi there,

I've tried installing as per the instructions, but I get the following error;

/home/graeme/.rvm/gems/ree-1.8.7-2011.03@epra/gems/devise-1.4.5/lib/devise/models.rb:60:in `const_get': uninitialized constant Devise::Models::Activatable (NameError)

If I include suspendable but leave out activatable I don't get an error but it doesn't stop the user from logging in either.

Thanks,
Graeme