can anyone tell me what is wrong with this source cODE.

WHEN I COMPILE USING PROTEUS KIEL 5 THE PROGRAM SHOWS ERROR L121:IMPROPER FIXUP . WHEN I DELETE INTERRUPT 2 THE COMPILER COMPILES SUCESSFULLY. HELP PLESE ANYONE.
can anyone tell me what is wrong with this sour #include<reg51.h>
sbit op1=P2^7;
sbit op2=P2^6;
unsigned char data byt=0xFF;
void keydly()
{ int a,b;
for(a=0;a<50;a++)
for(b=0;b<1000;b++);
} void delay1ms(int d)
{ int k;
TL0 = 0x17;
TH0 = 0xFC;
TR0 = 1;
for(k=0;k<d;k++)
{ while(TF0==0);
TF0 = 0;
TL0 = 0x17;
TH0 = 0xFC;
} TR0 = 0;
} void delay50ms(int c)
{ int p;
TL1 = 0xAF;
TH1 = 0x3C;
TR1 = 1;
for(p=0;p<c;p++)
{ while(TF1==0);
TF1 = 0;
TL1 = 0xAF;
TH1 = 0x3C;
} TR1 = 0;
} void gripopen()
{ int x;
for(x=0;x<4;x++)
{ op1=0;
delay1ms(4);
op1=1;
delay1ms(20);
} }
void gripclose()
{ int y;
for(y=0;y<4;y++)
{ op1=0;
delay1ms(1);
op1=1;
delay1ms(20);
} }
void gripclk()
{ int w;
for(w=0;w<4;w++)
{ op2=0;
delay1ms(4);
op2=1;
delay1ms(20);
} }
void gripaclk()
{ int z;
for(z=0;z<4;z++)
{ op2=0;
delay1ms(1);
op2=1;
delay1ms(20);
} }
void gripup()
{ P2=0x01;
delay50ms(20);
P2=0x00;
} void gripdwn()
{ P2=0x02;
delay50ms(20);
P2=0x00;
} void rotetleft()
{ P2=0x04;
delay50ms(40);
P2=0x00;
} void rotetright()
{ P2=0x08;
delay50ms(40);
P2=0x00;
} void int1() interrupt 2
{ byt=P1;
EA=0;
keydly();
} void main()
{ TMOD = 0x11;
P2=0x00;
P0=0x00;
op1=1;
op2=1;
P1=0xFF;
back: IE=0x84;
byt=0xFF;
while(byt==0xFF);
switch(byt)
{ case 0xF1:
gripopen();
break;
case 0xF2:
gripclose();
break;
case 0xF3:
gripclk();
break;
case 0xF4:
gripaclk();
break;
case 0xF5:
gripup();
break;
case 0xF6:
gripdwn();
break;
case 0xF7:
rotetleft();
break;
case 0xF8:
rotetright();
break;
} goto back;
}