PIC 18f452: Interrupt using CCS.. Help!

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#include <18F452_new.h>
#fuses NOWDT,WDT128,HS,NOPROTECT, NOOSCSEN, BROWNOUT, BORV20, NOPUT, STVREN, NODEBUG, NOLVP, NOWRT, NOWRTD, NOWRTB, NOWRTC, NOCPD, NOCPB, NOEBTR, NOEBTRB
#use delay(clock=20000000)
#INCLUDE <stdlib.h>
#ZERO_RAM
#use fast_io(A)
#define NOP #asm nop #endasm
#INCLUDE <dt_lcd_v01.c>
 
#INT_EXT
void ext_isr() 
{
if(!input(RST))
{
delay_ms(3000);
if(!input(RST))
{
state=0;
output_low(FD_F);output_low(MDM_L);output_low(ALARM);output_low(IGN);output_low(Pilot);
output_low(MAIN_1);output_low(MAIN_2),output_low(MDM_H);
state=0;round=0;timer9=0;timer8=0;timer7=0;timer6=0;timer5=0;
cs_ldu=0;cs_sq2=0;cs_p=0;cs_ig=0;cs_sq5=0;cs_st=0;cs_str=0;
f=0;ELA=0;Errors=0;
}
}
}
void main()
{
SET_TRIS_A(0B1000000);
setup_adc(ADC_OFF);
setup_adc(NO_ANALOGS );
enable_interrupts(INT_EXT);// turn on interrupts
ext_int_edge(H_TO_L);      // init interrupt triggering for button press
dt_lcd_init();
dt_lcd_clear_screen();
dt_lcd_gotoxy(44,0);
printf(lcd_printchar,"OMNI");
dt_lcd_gotoxy(10,1);
printf(lcd_printchar,"TELEMETRY CO.");
dt_lcd_gotoxy(0,2);printf(dt_lcd_printchar,"----------------------");
dt_lcd_gotoxy(44,3);
printf(dt_lcd_printchar,"BURNER");
dt_lcd_gotoxy(10,4);
printf(dt_lcd_printchar,"MANAGEMENT SYSTEM");
dt_lcd_gotoxy(10,5);printf(dt_lcd_printchar,"BMS 5400");
dt_lcd_gotoxy(60,5);printf(dt_lcd_printchar,"(VER: 1.09)");
dt_lcd_gotoxy(0,6);
printf(dt_lcd_printchar,"----------------------");
dt_lcd_gotoxy(25,7);
printf(dt_lcd_printchar,"www.omnitm.ca");
delay_ms(7000);
dt_lcd_clear_screen();
rtos_run();
}