more verbose exception on role-not-found

vendor/engines/adva_user/lib/active_record/acts_as_role_context.rb

@@ -34,7 +34,7 @@ def role_authorizing(action, type = nil)
         type ||= self.class.name.demodulize.downcase.to_sym
         role = permissions[type][action] if respond_to?(:permissions) && permissions[type] 
         returning Role.build(role, self) || owner && owner.role_authorizing(action, type) do |role|
-          raise "could not find role for #{type}: #{action}" unless role
+          raise "could not find role for #{type}: #{action} (on: #{self.inspect})" unless role
           role.original_context = self
         end
       end