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MACROS TOO NESTED

C51 FATAL-ERROR - ACTION: PARSING SOURCE-FILE ERROR: PREPROCESSOR: MACROS TOO NESTED
C51 TERMINATED.

PLEASE TELL ME HOW TO SOLVE THIS ERROR.

Thanks for the Reply.Just one more help please .Just look at this code and please try to solve my error .I will be very thankful to you.Since many days i m trying to resolve this but i couldn't.

PROGRAMS:

LCD
#include <REGX52.H>
#define data P1
#define rs P3_5
#define rw P3_4
#define en P3_3
unsigned char msg[88];
void delay(unsigned int);
void LCD_busy();
void LCD_command(unsigned char var);
void LCD_data(unsigned char var);
void LCD_string(unsigned char *var);
void LCD_init(void);
void LCD_READY(void);
void LCD_init(void) { LCD_command (0x38); LCD_command (0x0C); LCD_command (0x01); LCD_command (0x06); }

void LCD_command(unsigned char var) { LCD_READY(); data = var; //Function set: 2 Line, 8-bit, 5x8 dots rs = 0; //Selected command register rw = 0; //We are writing in instruction register en = 1; //Enable H->L en = 0; }
void LCD_string(unsigned char *var) { while(*var) //till string ends LCD_data(*var++); //send characters one by one }
void LCD_data(unsigned char var) { LCD_READY(); data = var; //Function set: 2 Line, 8-bit, 5x7 dots rs = 1; //Selected data register rw = 0; //We are writing en = 1; //Enable H->L en = 0; }
void LCD_READY(void) { P1_7=1; rs=0; rw=1; do { en=0; en=1; delay(1); }while(P1_7); }
void delay(unsigned int m) { unsigned int i,j; for(i=0;i<m;i++) for(j=0;j<10;j++); }

KEYPAD

#include <regx52.H>
#include "lcd.c"
char key_scan();
unsigned char key[4][3]={'1','2','3', '4','5','6', '7','8','9', '*','0','#'};

char key_scan()
{ unsigned char col, row;
P2=0xF0;
while(1) { do { col=P2&0x70; }while(col!=0x70); do { do { delay(20); col=P2&0x70; }while(col==0x70); delay(20); col=P2&0x70; }while(col==0x70);
while(1)
{ P2=0x7E; col=P2&0x70; if(col!=0x70) { row=0; break; }

P2=0x7D; col=P2&0x70; if(col!=0x70) { row=1; break; } P2=0x7B; col=P2&0x70; if(col!=0x70) { row=2; break; } P2=0x77; col=P2&0x70; row=3; break;
} if(col==0x60) return(key[row][0]);
else if(col==0x50) return(key[row][1]);
else if(col==0x30) return(key[row][2]); }
}

RTC

#include <regx52.H>
#include <absacc.h>
#include "lcd.c"
#include "rtc1.c"
#include "keypad.c"

void rtc_init()
{ XBYTE[10]=0x20;
delay(100);
}

void time_set()
{ unsigned char temp[3];
XBYTE[11]=0x83;
LCD_command(0x01);
LCD_string("Enter the Time : ");
LCD_command(0xC0);
LCD_string("HH:mm:ss");
LCD_command(0xC0);
//Enter hour
temp[0]=key_scan();
LCD_data(temp[0]);
temp[1]=key_scan();
LCD_data(temp[1]);
LCD_string(":");
XBYTE[4]=int_value(temp);
//Enter min
temp[0]=key_scan();
LCD_data(temp[0]);
temp[1]=key_scan();
LCD_data(temp[1]);
LCD_string(":");
XBYTE[2]=int_value(temp);
//Enter sec
temp[0]=key_scan();
LCD_data(temp[0]);
temp[1]=key_scan();
LCD_data(temp[1]);
XBYTE[0]=int_value(temp);
delay(500);
XBYTE[11]=0x03;
}

void alarm_set()
{ unsigned char temp[3];
XBYTE[11]=0x83;
LCD_command(0x01);
LCD_string("Enter the Time : ");
LCD_command(0xC0);
LCD_string("HH:mm:ss");
LCD_command(0xC0);
//Enter hour
temp[0]=key_scan();
LCD_data(temp[0]);
temp[1]=key_scan();
LCD_data(temp[1]);
LCD_string(":");
XBYTE[5]=int_value(temp);
//Enter min
temp[0]=key_scan();
LCD_data(temp[0]);
temp[1]=key_scan();
LCD_data(temp[1]);
LCD_string(":");
XBYTE[3]=int_value(temp);
//Enter sec
temp[0]=key_scan();
LCD_data(temp[0]);
temp[1]=key_scan();
LCD_data(temp[1]);
XBYTE[1]=int_value(temp);
delay(800); LCD_command(0x01);
LCD_string("Enter OFF Time:");
LCD_command(0xC0);
temp[0]=key_scan();
LCD_data(temp[0]);
if(temp[0]=='#')
{XBYTE[11]=0x03;return;}
temp[1]=key_scan();
LCD_data(temp[1]);
XBYTE[14]=int_value(temp);
XBYTE[11]=0x03;
}

void bcdconv(unsigned var)
{ unsigned char x,y;
x=var&0x0F;
y=y>>4;
y=y|0x30;
LCD_data(y);
LCD_data(x);
}

int int_value(unsigned char var[])
{ int val;
val=(var[0]<<4)|(var[1]&0x0F);
return(val);
}

MAIN PROGRAM

#include <regx52.H>
#include <absacc.h>
#include "lcd.c"
#include "rtc1.c"
#include "keypad.c"
int time;
void update();
void relay();
void time_display();
void alarm_display();

int main()
{ int irq;
irq=XBYTE[12];
P3_2=1;
rtc_init();
LCD_init();
while(1)
{ LCD_command(0x01);
time_display();
if(XBYTE[12]&0x20)
relay();
if(P3_2==0)
update();
alarm_display();
delay(7500);
} }

void update()
{ char n;
LCD_command(0x01);
LCD_string("1. Time Update");
LCD_command(0xC0);
LCD_string("2. ALARM UPDATE");
n=key_scan();
switch(n) { case '1' : time_set(); break; case '2' : alarm_set(); break; default : LCD_command(0x01); LCD_string("Try Again"); delay(100); LCD_command(0x01); }

}

void time_display()
{ unsigned char hr,min,sec;
LCD_command(0x80);
LCD_string("TIME : ");
hr=XBYTE[4];
min=XBYTE[2];
sec=XBYTE[0];
bcdconv(hr);
LCD_string(":");
bcdconv(min);
LCD_string(":");
bcdconv(sec);
}

void alarm_display()
{ LCD_command(0xC0);
LCD_string("PW_OFF: ");
bcdconv(XBYTE[5]);
LCD_string(":");
bcdconv(XBYTE[3]);
LCD_string(":");
bcdconv(XBYTE[1]);
}

void relay()
{ int al_hr,al_min,hh,mm,temp;
temp=XBYTE[12];
time=XBYTE[14];
time=(((time>>4)*10)+(time&0x0F));
P3_1=0;
hh=XBYTE[5];
mm=XBYTE[3];
hh=(((hh>>4)*10)+(hh&0x0F));
mm=(((mm>>4)*10)+(mm&0x0F));
al_min=time+mm;
al_hr=al_min/60;
al_hr=al_hr+hh;
al_min=al_min%60;
al_hr=al_hr%24;
al_min=(((al_min/10)<<4)|(al_min%10));
al_hr=(((al_hr/10)<<4)|(al_hr%10));
XBYTE[3]=al_min;
XBYTE[5]=al_hr;
LCD_command(0xC0);
LCD_string("PWR_ON: ");
bcdconv(al_hr);
LCD_string(":");
bcdconv(al_min);
LCD_string(":");
bcdconv(XBYTE[1]);
mm=(((mm/10)<<4)|(mm%10));
hh=(((hh/10)<<4)|(hh%10));
while(1)
{ time_display();
if(XBYTE[12]&0x20)
{ P3_1=1;
XBYTE[3]=mm;
XBYTE[5]=hh;
break;
} }
}