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which gem is best for authentication in Rails 4?? I try to use devise but I got problem with it.
.rvm/gems/ruby-2.0.0-p0/gems/activemodel-4.0.0.beta1/lib/active_model/deprecated_mass_assignment_security.rb:14:in `attr_accessible': `attr_accessible` is extracted out of Rails into a gem. Please use new recommended protection model for params(strong_parameters) or add `protected_attributes` to your Gemfile to use old one. (RuntimeError)
from /home/leapfrog/projects/kathloc/app/models/user.rb:8:in `<class:User>'
from /home/leapfrog/projects/kathloc/app/models/user.rb:1:in `<top (required)>'
from /home/leapfrog/.rvm/gems/ruby-2.0.0-p0/gems/activesupport-4.0.0.beta1/lib/active_support/dependencies.rb:423:in `load'
from /home/leapfrog/.rvm/gems/ruby-2.0.0-p0/gems/activesupport-4.0.0.beta1/lib/active_support/dependencies.rb:423:in `block in load_file'
from /home/leapfrog/.rvm/gems/ruby-2.0.0-p0/gems/activesupport-4.0.0.beta1/lib/active_support/dependencies.rb:615:in `new_constants_in'
from /home/leapfrog/.rvm/gems/ruby-2.0.0-p0/gems/activesupport-4.0.0.beta1/lib/active_support/dependencies.rb:422:in `load_file'
from /home/leapfrog/.rvm/gems/ruby-2.0.0-p0/gems/activesupport-4.0.0.beta1/lib/active_support/dependencies.rb:323:in `require_or_load'
from /home/leapfrog/.rvm/gems/ruby-2.0.0-p0/gems/activesupport-4.0.0.beta1/lib/active_support/dependencies.rb:462:in `load_missing_constant'
from /home/leapfrog/.rvm/gems/ruby-2.0.0-p0/gems/activesupport-4.0.0.beta1/lib/active_support/dependencies.rb:183:in `const_missing'
from /home/leapfrog/.rvm/gems/ruby-2.0.0-p0/gems/activesupport-4.0.0.beta1/lib/active_support/inflector/methods.rb:226:in `const_get'
from /home/leapfrog/.rvm/gems/ruby-2.0.0-p0/gems/activesupport-4.0.0.beta1/lib/active_support/inflector/methods.rb:226:in `block in constantize'
from /home/leapfrog/.rvm/gems/ruby-2.0.0-p0/gems/activesupport-4.0.0.beta1/lib/active_support/inflector/methods