unfortunately process com.android.phone has stopped

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http://forums.androidcentral.com – HI I have updated my Sony Xperia S to the latest Andriod update (Jelly Bean). now when I m restarting my device massage pops up saying "(unfortunately process com.android.phone has stopped)". then i have to restart again and againd untel it goes . what is the problem please help (HowTos)