Try a restart and if that doesn't work, try a reset (home + on/off and hold both for about 10 seconds until the Apple logo shows up). Most of the time that will take care of it. If it doesn't, you might want to try to use iCloud back up to restore the data. http://support.apple.com/kb/ht4859
Answer
Try a restart and if that doesn't work, try a reset (home + on/off and hold both for about 10 seconds until the Apple logo shows up). Most of the time that will take care of it. If it doesn't, you might want to try to use iCloud back up to restore the data. http://support.apple.com/kb/ht4859