错误提示：syntax error near 'sfr'是怎么回事？

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#include<reg52.h>
sbit P1_1=P1^1;
sbit P1_0=P1^0;
sbit LEFTDETECT=P1^2;
sbit RIGHTDETECT=P3^5;
sbit LEFTLAUNCH=P1^3;
sbit RIGHTLAUNCH=P3^6;
#define KpL -70
#define KpR 70
#define SetPoint 2 //暂定值，根据实际情况要改的
#define CenterPulse 1500
unsigned int time;//全局变量
int leftdistance,rightdistance; //左边和右边距离
int delaycount,distanceleft,distanceright,irdetectleft,irdetectright;//这四个定义的我好像没用到
unsigned int frequency[5]={29370,31230,33050,35700,38460};
void delay_nus(unsigned int i)
{
   i=i/10;
   while(--i);
}
void delay_nms(unsigned int n)
{
  n=n+1;
  while(--n)
  delay_nus(900);
}
void initial(void) //串口初始化
{
  IE=0x82;
  TCON=0x00;
  TMOD=0x01;
 
}
void frequencyout(unsigned int frequency)
{
  time=256-(50000/frequency);
  TH0=0xff;//不参与计数
  TL0=time;
  TR0=1;
  delay_nus(800);
  TR0=0;
}
void timer0_interrupt(void)interrupt 1
{
  LEFTLAUNCH=~LEFTLAUNCH;
  RIGHTLAUNCH=~RIGHTLAUNCH;
  TH0=0xff;
  TL0=time;
}
void get_distances()
{
  unsigned char count;
  leftdistance=0;
  rightdistance=0;
  for(count=0;count<5;count++)
  {
    frequencyout(frequency[count]);
    if(LEFTDETECT==1)
    leftdistance++;
    if(RIGHTDETECT==1)
    rightdistance++;
  }
}
void send_pulse(unsigned int pulseleft,unsigned int pulseright)
{
  P1_1=1;
  delay_nus(pulseleft);
  P1_1=0;
  P1_0=1;
  delay_nus(pulseright);
  P1_0=0;
  delay_nms(18);
}
int main(void)
{
  unsigned int pulseleft,pulseright;
  initial();
  while(1)//为了能够90秒时停，此处需修改
  {
    get_distances();
    pulseleft=(SetPoint-leftdistance)*KpL+CenterPulse;
    pulseright=(SetPoint-rightdistance)*KpR+CenterPulse;
    send_pulse(pulseleft,pulseright);
  }
}
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