代码编译错误，帮我修改一下

Params

Numeric length(30);
Numeric i(100);
Numeric lots(1);

Vars

Series<Numeric> mta;
Series<Numeric> mtb;
Numeric LRSlope; 
Numeric LRAngle;
Numeric LRIntercept;
Numeric LRValue;
Numeric LRSlope1; 
Numeric LRAngle1;
Numeric LRIntercept1;
Numeric LRValue1; 
Numeric mt;
Begin

LinearReg(Close[1],length,0,LRSlope, LRAngle, LRIntercept, LRValue);
mta=LRSlope;
LinearReg(mta*50,length,0,LRSlope1, LRAngle1, LRIntercept1, LRValue1);
mtb=LRSlope1; 
mt=mta*mtb*50;
//{ 
if(MarketPosition!=1 And mt>I And mta>0) 
{
    if(MarketPosition==-1) 
     BuyToCover(0,0);
 Else 
  Buy(lots,Open);
}
if(MarketPosition!=-1 And mt>I And mta<0)  
{
    if(MarketPosition==1) 
     Sell(0,0);
    Else 
     SellShort(lots,Open);
}
if(MarketPosition==1 and mt<0)

    Sell(lots,0);

if(MarketPosition==-1 and mt<0)

 BuyToCover(lots,0);

End