Error 491 is a communications error. I suspect GoogleServicesFramework.apk
is broken. Please go back to How to: Install Google Play Noob (Simple) Version and perform the complete install again.
It is better to replace these 4 files rather than spend hours trying to figure
out which one is broken. If you perform the steps, you will get Google Play
to function again. If you can not get it to work, PM us, we offer free
support to everyone in the XDA Community.