Facing an error in creating a Inverse Fisher transform of a smoothed RSI

[indus383]

Having an error with this code--

var RSI = null;
var WMA1 = null;
var WMA2 = null;
var WMA3 = null;
var fpArray = new Array();

function preMain(){
setStudyTitle("INVERSE FISHER TRANSFORM OF RSI");
setCursorLabelName("IFish",0);
setDefaultBarFgColor(Color.RGB(0x00,0xc9,0x57),0);
addBand(.75, PS_SOLID, 1, Color.black);
addBand(-.75, PS_SOLID, 1, Color.black);
setDefaultBarThickness(2);
//setComputeOnClose();
InitFunctionParameter();
}

function main(RSI_Length,hma_length){

hmaLength = hma_length;//default 9
rsiLength = RSI_Length;//default 5

if (RSI == null) RSI = rsi(rsiLength,close());
if (WMA1== null) WMA1 = wma(hma_length,RSI);
if (WMA2== null) WMA2 = wma(Math.floor(hma_length/2),RSI);

if(getCurrentBarCount() < RSI_Length + 5*hma_length) return;

var i = 0;
var sum =0;
var Length = Math.floor(Math.sqrt(hma_length));
for (i=0; i < Length; i++)
sum = sum + (Length-i) ( 2*(WMA2.getValue(-i)) - WMA1.getValue(-i));
Value = 2*sum/Length/(Length+1);


var IFish = 0;

IFish = (Math.exp(2 * Value) - 1) / (Math.exp(2 * Value) + 1);

if(IFish > 0) setBarFgColor(Color.green)
else setBarFgColor(Color.red);

return IFish;


}


function InitFunctionParameter()
{
var x = 0;

fpArray[x] = new FunctionParameter("RSI_Length", FunctionParameter.NUMBER);
with(fpArray[x++])
{
setName("RSI_Length");
setLowerLimit(1);
setDefault(9);
}

fpArray[x] = new FunctionParameter("hma_length", FunctionParameter.NUMBER);
with(fpArray[x++])
{
setName("hma_length");
setLowerLimit(1);
setDefault(5);
}
}

[indus383]

Issue resolved, a small coding error

sum = sum + (Length-i) ( 2*(WMA2.getValue(-i)) - WMA1.getValue(-i));

has to be replaced with sum = sum + (Length-i) * ( 2*(WMA2.getValue(-i)) - WMA1.getValue(-i));