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startup code problems

hello all
installed the latest mdk370. getting problem in start up code.

if i create a new project with aduc7020, the startup code added automatically is giving me the following errors.

 Build target 'Target 1'
compiling main.c...
main.c(2): warning:  #951-D: return type of function "main" must be "int"
main.c(7): warning:  #1-D: last line of file ends without a newline
compiling Retarget.c...
assembling ADuC702x.s...
linking...
testing.axf: Error: L6218E: Undefined symbol Undef_Handler (referred from aduc702x.o).
testing.axf: Error: L6218E: Undefined symbol SWI_Handler (referred from aduc702x.o).
testing.axf: Error: L6218E: Undefined symbol PAbt_Handler (referred from aduc702x.o).
testing.axf: Error: L6218E: Undefined symbol DAbt_Handler (referred from aduc702x.o).
testing.axf: Error: L6218E: Undefined symbol IRQ_Handler (referred from aduc702x.o).
testing.axf: Error: L6218E: Undefined symbol FIQ_Handler (referred from aduc702x.o).
Target not created

if i take build the blinky example than there is no error, furthermore putting blinky start up code in my project removes the errors.

so i started comparing the start up code, and found the difference which is causing the errors..
here it is

this is the one that is added by the uvision it self

 Vectors         LDR     PC, Reset_Addr
                LDR     PC, Undef_Addr
                LDR     PC, SWI_Addr
                LDR     PC, PAbt_Addr
                LDR     PC, DAbt_Addr
                NOP                            ; Reserved Vector
                LDR     PC, IRQ_Addr
                LDR     PC, FIQ_Addr

                EXTERN Undef_Handler
                EXTERN SWI_Handler
                EXTERN PAbt_Handler
                EXTERN DAbt_Handler
                EXTERN IRQ_Handler
                EXTERN FIQ_Handler

Reset_Addr      DCD     Reset_Handler
Undef_Addr      DCD     Undef_Handler
SWI_Addr        DCD     SWI_Handler
PAbt_Addr       DCD     PAbt_Handler
DAbt_Addr       DCD     DAbt_Handler
                DCD     0                      ; Reserved Address
IRQ_Addr        DCD     IRQ_Handler
FIQ_Addr        DCD     FIQ_Handler

this is the one that is in the example.

 Vectors         LDR     PC, Reset_Addr
                LDR     PC, Undef_Addr
                LDR     PC, SWI_Addr
                LDR     PC, PAbt_Addr
                LDR     PC, DAbt_Addr
                NOP                            ; Reserved Vector
                LDR     PC, IRQ_Addr
                LDR     PC, FIQ_Addr

Reset_Addr      DCD     Reset_Handler
Undef_Addr      DCD     Undef_Handler
SWI_Addr        DCD     SWI_Handler
PAbt_Addr       DCD     PAbt_Handler
DAbt_Addr       DCD     DAbt_Handler
                DCD     0                      ; Reserved Address
IRQ_Addr        DCD     IRQ_Handler
FIQ_Addr        DCD     FIQ_Handler

EXTERN Undef_Handler
SWI_Handler     B       SWI_Handler
PAbt_Handler    B       PAbt_Handler
DAbt_Handler    B       DAbt_Handler
IRQ_Handler     B       IRQ_Handler
FIQ_Handler     B       FIQ_Handler

please can some one expolain what

 EXTERN Undef_Handler

means

and what

 EXTERN Undef_Handler

means

and what effects they have

regards
Nashit Ashraf