ERROR (e46) while debugging

hello,

i am working with MSP430f5438 and using FET-debugger(msp-FET430UIF).

While running a program for simple 4 bit binary counter as follows; i encountered with error e46.

#include "msp430.h"
;-------------------------------------;
          ORG   0E100H               
;-------------------------------------;
RESET     mov.w   #01500h,SP         
Stopwdt   mov.w   # WDTPW+WDTHOLD,&WDTCTL    

;--------------------------------------;

setupP1   mov.b   #0ffh,&P1DIR      
load      mov.b   #0ffh,&P1OUT         
         
;----------------------------------------;

mainloop  mov.w   #00fh,R14            
          mov.w   #00000d,R15
L1        inc.w   R15
          mov.b   R15,&P1OUT
          call    #delay_16ms 
          cmp.w   R15,R14
          jnz     L1
;--------------------------------------------;

delay_16ms   mov.w    #50000d,R15
L2           dec.w    r15
             jnz      L1
             ret
;---------------------------------------------;

           
            ORG     0FFF0h                  ; MSP430 RESET Vector location
            DW      RESET                   ; RESET lable
            END

error:Error[e46]: Undefined external "main" referred in ?cstart ( C:\Program Files\IAR Systems\Embedded Workbench 6.0 Evaluation\430\LIB\DLIB\dl430xsfn.r43 )
Error while running Linker

please help.