Problem solved...by moving ALL rows and columns to PortB ...
Code:
    ;    Default settings
    ;    ================
KB_ROW        = 4                                      ; 4 ROW keypad
KB_ROW_PORT   = PORTB                                  ; Keypad ROW on PORTB
KB_ROW_BIT    = 0                                      ; ROW0 = PORTB.0
KB_COL        = 4                                      ; 4 COL keypad
KB_COL_PORT   = PORTB                                  ; Keypad Col on PORTB
KB_COL_BIT    = 4                                      ; COL0 = PORTB.4
DebounceDelay = 0x200                                  ; debounce delay 200mSec
SINGLE_SCAN   = 0                                      ; Scan ;till a key is pressed