Unfortunately system ui has stopped

[Amit_maurya]

My phone is getting blocked by this. I've not installed any new app recently. CAn anyone point out how can I get this corrected

[_alexdon_]

Boot in safe mode:

http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008

See how it goes.