added rescue functionality for cancan

app/controllers/application_controller.rb

@@ -1,3 +1,7 @@
 class ApplicationController < ActionController::Base
   protect_from_forgery
+  
+  rescue_from CanCan::AccessDenied do |exception|
+    redirect_to root_url, :alert => "You don't have access to that feature. Please try again."
+  end
 end