This issue is already known:
Double double toil and trouble, something wicked this way comes! Spooky season is upon us, and you know what that means, Forge fans! Its time to light your lanterns and summon some courage: our creepiest event is back in town for Halloween! The Halloween Event will begin on October 4th and...
forum.beta.forgeofempires.com
Sadly, there is nothing at the moment you can do to continue, you have to wait until the issue is fixed