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After the reset, did you restore any type of back up or installed any application? I suggest that you boot your phone into safe mode to see if you receive the same error message:
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008
If you have tried a repair and it still doesn't work then you have 2 options - Take it back to the place of purchase or contact Sony care http://www.sonymobile.com/global-en/support/contact-us/