ok that is why. you are on an aosp rom. to get it setup you need to be on a sense rom. so lets flash this rom:
Download 651 Rooted Odexed Signed zip. this is just a stock rooted rom that should work. the other idea is that if you do not want to be rooted we can unroot you as well. but here are the instructions on how to flash a rom:
1.download the rom and move the file to the sd card. do not put it in folder.
2.power off then press and hold power+vol down
3.select recovery
4.while you are in recovery lets make a nandroid backup. select backup and restore then backup. this will make a backup for you in case something goes wring.
5.wipe dalvik cache (depending on which recovery you have it might be under advanced), cache (partition), and data(factory reset)
6.select install zip from sd card
7.find your rom and select it by navigating to it with your vol up and down buttons and power to select the file.
8.once done you can reboot.
now you should have the stock rom and you can now either call or take it in to sprint. l
and like i said if you choose not to have your phone rooted, we can unroot you if you choose.