89v51rd2 error 127

I am using P89V51RD2 for my project I have choosen this IC because it have 1K Ram
My programme is compiling but while linking I ma getting following errors.

*** ERROR L127: UNRESOLVED EXTERNAL SYMBOL
    SYMBOL:  ask_disp_key_val
    MODULE:  mc_ad1.obj (MC_AD1)
*** ERROR L127: UNRESOLVED EXTERNAL SYMBOL
    SYMBOL:  chk_keys
    MODULE:  mc_ad1.obj (MC_AD1)
*** ERROR L127: UNRESOLVED EXTERNAL SYMBOL
    SYMBOL:  chk_test_over
    MODULE:  mc_ad1.obj (MC_AD1)
*** ERROR L128: REFERENCE MADE TO UNRESOLVED EXTERNAL
    SYMBOL:  ask_disp_key_val
    MODULE:  mc_ad1.obj (MC_AD1)
    ADDRESS: 10014D3H
*** ERROR L128: REFERENCE MADE TO UNRESOLVED EXTERNAL
    SYMBOL:  chk_keys
    MODULE:  mc_ad1.obj (MC_AD1)
    ADDRESS: 10014D9H
*** ERROR L128: REFERENCE MADE TO UNRESOLVED EXTERNAL
    SYMBOL:  chk_test_over
    MODULE:  mc_ad1.obj (MC_AD1)
    ADDRESS: 10014DCH
*** ERROR L127: UNRESOLVED EXTERNAL SYMBOL
    SYMBOL:  MAIN
    MODULE:  C:\KEIL\C51\LIB\C51L.LIB (?C_INIT)
*** ERROR L128: REFERENCE MADE TO UNRESOLVED EXTERNAL
    SYMBOL:  MAIN
    MODULE:  C:\KEIL\C51\LIB\C51L.LIB (?C_INIT)
    ADDRESS: 1000E67H
Program Size: data=28.1 xdata=143 const=0 code=6729
Target not created

I am using some of the variables as xdata,I am confused whether this problem is because of xdata?
I have done the folloeing changes to startup file also

XDATASTART      EQU     0H      ; the absolute start-address of XDATA memory
XDATALEN        EQU     2ffH      ; the length of XDATA memory in bytes.

AUXR1 DATA  08EH               ; add SFR definition

STARTUP1:
                               ; enable on-chip xdata RAM
          ANL AUXR1,#NOT 02H   ; AUXR1/Bit 1 (clear to 0 to enable on-chip XRAM)

also my target settings are
memory model : large
code Rom : Large
Use onchip Rom:selected
Use onchi XRam :selected
Use Multiple DPTR : Selected

Please help me out.