Hi Batman! I got that forced close message several times with the Appstore app. If it continues for you I will try to remember what I did to fix it. I know I googled the exact terminology and found an answer that had me go to the Amazon web page and delete my PE registration with them, then reinstall the app and reregister it with Amazon. You might just need to register your PE as your second device, or something like that.

Good luck!