hi,

first of all, use your real name, please.

As about the problem: external interrupt 1 must be defined as

void interrupt_1_handler (void) interrupt 2

Interrupt 1 is one of timer 0. The asm window shows you that address 0x0013 (which is the vector of external interrupt 1) has no program code filled.

By the way: do not use the same register banks (using 1) for interrupts which have different priority.

Regards,
Oleg