Hello,
This "DT_INTS-18-k80.bas" and the matching re-enter file, did you download them from somewhere or are you trying to customize the default ones yourself?

I don't have those files and a simple search did not find them so I can't test much here except compiling a bare bones example with the standard DT-Ints-18 files and, needless to say, it compiles and assembles without errors.
Code:
CLEAR                       'Clears memoryinclude "codesize.pbp" .
Define Measure 1

wsave1 var byte $A0 system  ;location for W if in bank0
wsave2 var byte $120 system ;location for W if in bank0                                           
wsave3 var byte $1A0 system ;location for W if in bank0


INCLUDE "DT_INTS-18.bas"    ; Basic Interrupt System
INCLUDE "ReEnterPBP-18.bas" ; Include if using PBP interrupts

DEFINE OSC 20              ' clock frequency
DEFINE USE_HIGHPRIORITY 1  ' use high priority interrupts
'define USE_LOWPRIORITY  1 ' not using low priority interrupts
 
DEFINE WRITE_INT 1

INTCON2.6 = 0           ' Int on falling edge 
                        
' Set up data direction registers for all the pins.
TRISA = %00111111       ' Set PORTA RA6 is Osc output to crystal
TRISB = %00101001       ' Set PORTB
TRISC = %00010100       ' Set PORTC
TRISD = %00000011       ' Set PORTD
TRISE = %00111011       ' Set PORTE only lower 4 bits available

';----[High Priority Interrupts]----------------------------------------
ASM
INT_LIST  macro    ; IntSource,    Label,      Type, ResetFlag?
        INT_Handler   TMR1_INT,  _ClockCount,   PBP,  yes  ;-- Timer Int.
        INT_Handler   INT0_INT,  _MoveCmd,      PBP,  yes  ;-- Flap Switch
   endm
    INT_CREATE          ; Creates High Priority interrupt processor
ENDASM

Main:
GOTO Main

'-------------------------------------------------------------------------------------------------
' Interrupt service routine
'-------------------------------------------------------------------------------------------------
ClockCount:
    LATA.0 = !LATA.0
@ INT_RETURN

MoveCmd:
    LATB.0 = !LATB.0
@ INT_RETURN
If you try the above with the stock DT-Ints files, does it compile? If you try with your K80-version of the DT-Ints files, does it compile?

/Henrik.