The following information is a direct statement from TinyCo:
We recently released an official statement on Reddit about the chickenDeco error. It can be found at this link:
The latest Family Guy: The Quest for Stuff updated included a fix for the recent ChickenDeco load error to allow players to load their games. Players who have been affected by this error will now be able to access their game, but may find that their towns are not what they remember. This is due to that fact that those games have been altered by an unauthorized 3rd party. We are continuing to looking into how we can further resolve this.
If you’re affected please send all questions related to the error and now “changed game” to TinyCo.
Thanks ~ Russian Tigger