Default Can't call my XPERIA ACRO S

Please help, I cant call my Newly rooted sony xperia acro s 4.4.278.. Whenever I tried to call it, there's always a POP UP message "Unfortunately, the process com.android.phone has stopped" on my acro s. funny thing is that its ringing when i tried to call it.please help guys. Im new to this rooting thing