Si un novato quiere usar la señal de trading view para intercambiar automáticamente un contrato de perpetuidad de BTC, el error aparece después de la implementación del robot. El contrato Ct está configurado como vacío.
El código es una copia de la TradingViewWebHook estrategia de ejecución de señales ((Teaching)
/*

• Formato de la cadena de comandos interactiva
  action:amount
  action: buy , sell , long , short , cover_long , cover_short, spk , bpk

• Tipo de bolsa
  Valoración de las variables eType: 0 spot, 1 futuros

• Enlace a la documentación de TV
  https://www.tradingview.com/pine-script-docs/en/v4/Quickstart_guide.html
  https://cn.tradingview.com/chart/8xfTuX7F/

• TV webhook envía una solicitud
  https://www.fmz.cn/api/v1?access_key=xxx&secret_key=yyyy&method=CommandRobot&args=[186515,"action:amount"]

• Repositorio de referencias
  Citando el catálogo de transacciones de monedas digitales
  */

• ¿Qué es eso?
  // var IsMarketOrder = false
  // var QuotePrecision = 2
  // var BasePrecision = 2

// Los parámetros de los futuros
// var Ct = ""

// Variables globales
var BUY = "buy"
var SELL = "sell"
var LONG = "long"
var SHORT = "short"
var COVER_LONG = "cover_long"
var COVER_SHORT = "cover_short"
var SPK = "spk"
var BPK = "bpk"

function main() {
// Registro vacío, puede ser borrado si no es necesario
LogReset(1)

            
            
            
// 设置精度
exchange.SetPrecision(QuotePrecision, BasePrecision)

// 识别期货还是现货
var eType = 0
var eName = exchange.GetName()
var patt = /Futures_/
if (patt.test(eName)) {
    Log("添加的交易所为期货交易所：", eName, "#FF0000")
    eType = 1
    if (Ct == "") {
        throw "Ct 合约设置为空"
    } else {
    	Log(exchange.SetContractType(Ct), "设置合约：", Ct, "#FF0000")
    }
} else {
	Log("添加的交易所为现货交易所：", eName, "#32CD32")
}

var lastMsg = ""
var acc = _C(exchange.GetAccount)
while(true) {
    var cmd = GetCommand()
    if (cmd) {
        // 检测交互命令
        lastMsg = "命令:" + cmd + "时间:" + _D()
        var arr = cmd.split(":")
        if (arr.length != 2) {
            Log("cmd信息有误：", cmd, "#FF0000")
            continue
        }

        var action = arr[0]
        var amount = parseFloat(arr[1])

        if (eType == 0) {
            if (action == BUY) {               
                var buyInfo = IsMarketOrder ? exchange.Buy(-1, amount) : $.Buy(amount)
                Log("buyInfo:", buyInfo)
            } else if (action == SELL) {        
                var sellInfo = IsMarketOrder ? exchange.Sell(-1, amount) : $.Sell(amount)
                Log("sellInfo:", sellInfo)
            } else {
            	Log("现货交易所不支持！", "#FF0000")
            }
        } else if (eType == 1) {
        	var tradeInfo = null
        	var ticker = _C(exchange.GetTicker)
            if (action == LONG) {
            	exchange.SetDirection("buy")
                tradeInfo = IsMarketOrder ? exchange.Buy(-1, amount) : exchange.Buy(ticker.Sell, amount)
            } else if (action == SHORT) {        
                exchange.SetDirection("sell")
                tradeInfo = IsMarketOrder ? exchange.Sell(-1, amount) : exchange.Sell(ticker.Buy, amount)
            } else if (action == COVER_LONG) {        
                exchange.SetDirection("closebuy")
                tradeInfo = IsMarketOrder ? exchange.Sell(-1, amount) : exchange.Sell(ticker.Buy, amount)
            } else if (action == COVER_SHORT) {        
            	exchange.SetDirection("closesell")
            	tradeInfo = IsMarketOrder ? exchange.Buy(-1, amount) : exchange.Buy(ticker.Sell, amount)
            } else if (action == SPK) {   // 卖出平多仓，卖出开空仓
                exchange.SetDirection("closebuy")
                var tradeInfo1 = IsMarketOrder ? exchange.Sell(-1, amount) : exchange.Sell(ticker.Buy, amount)
                exchange.SetDirection("sell")
                var tradeInfo2 = IsMarketOrder ? exchange.Sell(-1, amount) : exchange.Sell(ticker.Buy, amount)
                tradeInfo = [tradeInfo1, tradeInfo2]
            } else if (action == BPK) {   // 买入平空仓，买入开多仓
                exchange.SetDirection("closesell")
                var tradeInfo1 = IsMarketOrder ? exchange.Buy(-1, amount) : exchange.Buy(ticker.Sell, amount)
                exchange.SetDirection("buy")
                var tradeInfo2 = IsMarketOrder ? exchange.Buy(-1, amount) : exchange.Buy(ticker.Sell, amount)
                tradeInfo = [tradeInfo1, tradeInfo2]
            } else {
            	Log("期货交易所不支持！", "#FF0000")
            }
            if (tradeInfo) {
                Log("tradeInfo:", tradeInfo)
            }
        } else {
        	throw "eType error, eType:" + eType
        }
        acc = _C(exchange.GetAccount)
    }
    var tbl = {
    	type : "table", 
    	title : "状态信息", 
    	cols : ["数据"], 
    	rows : []
    }
    tbl.rows.push([JSON.stringify(acc)])
    LogStatus(_D(), eName, "上次接收到的命令：", lastMsg, "\n", "`" + JSON.stringify(tbl) + "`")
	Sleep(1000)
}

}