AVR-Chat

I am confounded and flummoxed.   I  have an assembly program I am 
attempting to build in AVRStudio, but the assembler is ignoring my 
code.   I don't get it. I have compared it to other code I have which 
assembles just fine, and can find no difference which explains this 
behaviour.  The editor is highlighting syntax appropriately, so I am lost:


.include        "tn25def.inc"

;
;    interrupt table
;

.org    0                                                ; starting address

START:
INT0:            rjmp    DUMMY            ; external Interrupt 0
PCIO:            rjmp    DUMMY            ; pin change interrupt 0
OC1A:           rjmp    DUMMY            ; timer/counter 1 mompare match 1A
OVF1:           rjmp    DUMMY            ; timer/counter 1 overflow
OVF0:           rjmp    DUMMY            ; timer/counter 0 overflow
ERDY:          rjmp    DUMMY            ; EEPROM ready interrupt
ACI:              rjmp    DUMMY            ; Analog comparator interrupt
ADCC:          rjmp    DUMMY            ; ADC conversion ready interrupt
OC1B:           rjmp    DUMMY            ; timer/counter 1 compare match B
OC0A:           rjmp    DUMMY            ; timer/counter 0 ocmpare match A
OC0B:           rjmp    DUMMY            ; timer/counter 0 compare match B
WDT:            rjmp    DUMMY            ; watchdog timer interrupt
USI_START: rjmp    DUMMY            ; USI start interrupt
USI_OVF:      rjmp    DUMMY            ; USI overflow interrupt

;
;    end interrupt table
;

;
;    constant defintions
;

.equ    TRUE     =    0xff
.equ    FALSE    =    !TRUE
.equ    DIV         =    0x28                ; divisor for timer readings

START:

ldi        SPL,    SRAM_START        ; load stack pointer


   SO, what am I doing wrong?  Assembler says the source file is empty (??)


avrFrfeak