Pine script “松树文字”；保存操作失败，原因：错误"；错误

我刚刚开始我的松树之旅，但不能在电视聊天上发布脚本。我在哪里可以找到人调试下面的脚本，该脚本抛出“保存操作失败，原因：错误”错误？其余的都已经调试过了，所以对于一个有经验的人来说，这可能是一件非常简单的事情。任何帮助都将不胜感激

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谢谢你能提供的帮助

//@version=4
// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/

study(title="ATR Rising from Low Alert", shorttitle="Lowest ATR Rising", overlay=true, precision=0)

// Input options input(defval, title, type)
length = input(1, minval=2, title="ATR Lookback Length")
ticker1 = input(defval="Enter", title="Ticker1", type="syminfo.ticker")
ticker2 = input(defval="Enter", title="Ticker2", type="syminfo.ticker")

//Set variables
f_low = lowest[length] 

//Calculate the low ATR breakout
[f_low] = if tr[1]
    if tr = higher
        if volume > (volume[1] * 1.25)

//Set triggerAlert condition
triggerAlert = volume > (volume[1] * 1.25)
    true
else
    false

// Create alert - Can create dynamic alerts using {{}}
alertcondition(condition = triggerAlert, title = 'ATR Alert', message = 'ATR Breakout on {{syminfo.ticker}}!')

// Plot values
alertcondition(condition = triggerAlert, title = 'ATR Alert', message = 'ATR Breakout on {{syminfo.ticker}}!')

// Show Break Alerts
plotshape(triggerAlert, title="Buy", style=shape.labelup, location=location.belowbar, size=size.normal, text="Buy", textcolor = white, color=green, transp=0)