widest() error

// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © Hero_Hedge

//@version=4
study("Moving Average Cross Builder", shorttitle="MACB", overlay=true)
//Add in minval and step size to get float vales for fib
MA1Period = input( defval=50,title="Period of MA1", minval=0, step=1)
MA1Type = input(title="MA1 Type", defval="Simple", options=["Simple", "Smoothed", "Exponential", "Double Exponential", "Triple Exponential", "Weighted", "Hull", "Volume weighted", "McGinley", "Zero lag"])
MA1Source = input(title="MA1 Source", type=input.source, defval=close)
MA1Resolution = input(title="MA1 Resolution", type=input.resolution, defval="")
MA1Visible = input(title="Show MA1", type=input.bool, defval=true)

MA2Period = input(100, title="Period of MA2", minval=0, step=1)
MA2Type = input(title="MA2 Type", defval="Simple", options=["Simple", "Smoothed", "Exponential", "Double Exponential", "Triple Exponential", "Weighted", "Hull","Volume weighted", "McGinley", "Zero lag"])
MA2Source = input(title="MA2 Source", type=input.source, defval=close)
MA2Resolution = input(title="MA2 Resolution", type=input.resolution, defval="")
MA2Visible = input(title="Show MA2", type=input.bool, defval=false)

MA3Period = input(150, title="Period of MA3",minval=0)
MA3Type = input(title="MA3 Type", defval="Simple", options=["Simple", "Smoothed", "Exponential", "Double Exponential", "Triple Exponential", "Weighted", "Hull","Volume weighted", "McGinley", "Zero lag"])
MA3Source = input(title="MA3 Source", type=input.source, defval=close)
MA3Resolution = input(title="MA3 Resolution", type=input.resolution, defval="")
MA3Visible = input(title="Show MA3", type=input.bool, defval=false)

MA4Period = input(200, title="Period of MA4", minval=0)
MA4Type = input(title="MA4 Type", defval="Simple", options=["Simple", "Smoothed", "Exponential", "Double Exponential", "Triple Exponential", "Weighted", "Hull","Volume weighted", "McGinley", "Zero lag"])
MA4Source = input(title="MA4 Source", type=input.source, defval=close)
MA4Resolution = input(title="MA4 Resolution", type=input.resolution, defval="")
MA4Visible = input(title="Show MA4", type=input.bool, defval=false)

ma(MAType, MASource, MAPeriod) =>
    mg = 0.0
    smma = 0.0
    if MAType == "Simple"
        sma(MASource, MAPeriod)
    else if MAType =="Exponential"
        ema(MASource, MAPeriod)
    else if MAType == "Weighted"
        wma(MASource, MAPeriod)
    else if MAType == "Hull"
        hma(MASource, MAPeriod)
    else if MAType == "Volume weighted"
        vwma(MASource, MAPeriod)
    else if MAType == "Double Exponential"
        e = ema(MASource, MAPeriod)
        2 * e - ema(e, MAPeriod)
    else if MAType == "Triple Exponential"
        e = ema(MASource, MAPeriod)
        3 * (e - ema(e, MAPeriod)) + ema(ema(e, MAPeriod), MAPeriod) // EVERYTHING GOOD UNTIL HERE
    else if MAType == "Smoothed"
        len = input(7, minval=1, title="Length")
        src = input(close, title="Source")
        smma := na(smma[1]) ? sma(src, len) : (smma[1] * (len - 1) + src) / len
    else if MAType == "Zero lag"  //script by HPotter
        xPrice = MASource
        nPeriod = MAPeriod
        xLag = (nPeriod - 1) / 2
        xEMAData = (xPrice + (xPrice - xPrice[xLag]))
        xZLEMA = ema(xEMAData, nPeriod)
    else if MAType == "McGinley"
        Mglength = MAPeriod
        source = MASource
        mg := na(mg[1]) ? ema(source, Mglength) : mg[1] + (source - mg[1]) / (Mglength * pow(source/mg[1], 4))
    else
        float(na)

MA1 = security(syminfo.tickerid, MA1Resolution,  ma(MA1Type, MA1Source, MA1Period))
MA2 = security(syminfo.tickerid, MA2Resolution,  ma(MA2Type, MA2Source, MA2Period))
MA3 = security(syminfo.tickerid, MA3Resolution,  ma(MA3Type, MA3Source, MA3Period))
MA4 = security(syminfo.tickerid, MA4Resolution,  ma(MA4Type, MA4Source, MA4Period))

plot(MA1Visible ? MA1 : na, color=color.red, title="MA1")
plot(MA2Visible ? MA2 : na, color=color.yellow, title="MA2")
plot(MA3Visible ? MA3 : na, color=color.green, title="MA3")
plot(MA4Visible ? MA4 : na, color=color.blue, title="MA4")