Having troubles with an existing Notifications table

[ACR1209]

Hey, I'm currently having troubles implementing noticed into my project, my guess is due to an already existing Notification table. I simply followed the read me instructions for installing and creating a new notification. But keep getting:

Noticed::Notification.last.type
Noticed::Notification Load (0.8ms)  SELECT `noticed_notifications`.* FROM `noticed_notifications` ORDER BY `noticed_notifications`.`id` DESC LIMIT 1
Invalid single-table inheritance type: ReferenceActivatedNotifier::Notification is not a subclass of Noticed::Notification (ActiveRecord::SubclassNotFound)

I need to keep the original Notification model while we do a partial migration to noticed. I know there is another discussion with the same issue but I think the cause is different. Is there a way to fix this or is simply not supported?

My current setup

class ReferenceActivatedNotifier < ApplicationNotifier
  deliver_by :database

  param :invited_user
  param :amount_of_credits

  def message
    "The messsage."
  end

  def url
    Rails.application.routes.url_helpers.notifications_path
  end
end

class ApplicationNotifier < Noticed::Event
end