参数声明的数据类型错误，请高手指点！

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Params
    NumericSeries Price(1);
    Numeric EffRatioLength(10);
    Numeric FastAvgLength(2);
    Numeric SlowAvgLength(30);
Vars
    Numeric NetChg(0);
    Numeric TotChg(0);
    Numeric EffRatio(0);
    Numeric ScaledSFSqr(0);
    NumericSeries AMAValue;   
    Numeric SFDiff;
Begin
    if(CurrentBar == 0)
    {
        AMAValue = Price;
    }Else
    {
        NetChg = Abs( Price - Price[EffRatioLength] );
        TotChg = Summation( Abs( Price - Price[1] ), EffRatioLength );        
        EffRatio = IIF(TotChg > 0, NetChg / TotChg, 0);
        SFDiff = 2 / ( FastAvgLength + 1 ) - 2 / ( SlowAvgLength + 1 );        
        ScaledSFSqr = Sqr( 2 / ( SlowAvgLength + 1 ) + EffRatio * SFDiff );        
        AMAValue = AMAValue[1] + ScaledSFSqr * ( Price - AMAValue[1] );
    }
    Return AMAValue;
End

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