Mobius High Low Reversal Thinkscript, I need Some Help

[crn2920]

Here is a trend reversal that Mobius created back in 2018. I can't figure out why the Thinkscript isn't plotting when a candle closes above the day's highest price of the lowest low candle. I'd also like to have the down arrow red along with a red trend line of the lowest price on the highest high candle and green trend line of the highest price on the lowest low candle and the up arrow green when a candle closes higher than the highest price on the lowest low candle.

Thank you.

https://usethinkscript.com/threads/...dicator-intraday-strategy-for-thinkorswim.49/

# Regular Trading Hours High and Low Reversals
# Mobius
# V01.08.20.2018 Chat Room Request
# Alerts added by BenTen at useThinkScript.com

def h = high;

def l = low;

def c = close;

def x = barNumber();

def nan = double.nan;

def rth = getTime() >= RegularTradingStart(getYYYYMMDD()) and

getTime() <= RegularTradingEnd(getYYYYMMDD());

def LOD = if rth and !rth[1]

then l

else if rth and l < LOD[1]

then l

else LOD[1];

def LOD_x = if l == LOD and rth

then x

else nan;

def LOD_h = if l == LOD

then h

else LOD_h[1];

plot LOD_h_line = if x >= highestAll(LOD_x)

then highestAll(if isNaN(c[-1])

then LOD_h

else nan)

else nan;

LOD_h_line.SetDefaultColor(createColor(4,4,4));

LOD_h_line.hideBubble();

LOD_h_line.hideTitle();

def upBar = if c crosses above LOD_H_line and RTH

then x

else upBar[1];

plot ArrowUP = if x == highestAll(upBar)

then l - (2*TickSize())

else nan;

ArrowUP.SetPaintingStrategy(PaintingStrategy.Arrow_UP);

ArrowUP.SetLineWeight(3);

ArrowUP.SetDefaultColor(createColor(25,180,25));

ArrowUP.HideBubble();

ArrowUP.HideTitle();

def HOD = if rth and !rth[1]

then h

else if rth and h > HOD[1]

then h

else HOD[1];

def HOD_x = if h == HOD and rth

then x

else nan;

def HOD_l = if h == HOD

then l

else HOD_l[1];

plot HOD_l_line = if x >= highestAll(HOD_x)

then highestAll(if isNaN(c[-1])

then HOD_l

else nan)

else nan;

HOD_l_line.SetDefaultColor(createColor(75, 55, 175));

HOD_l_line.HideTitle();

HOD_l_line.HideBubble();

def dnBar = if c crosses below HOD_l_line

then x

else dnBar[1];

plot ArrowDN = if x == highestAll(dnBar)

then h + (2*TickSize())

else nan;

ArrowDN.SetPaintingStrategy(PaintingStrategy.Arrow_DOWN);

ArrowDN.SetLineWeight(3);

ArrowDN.SetDefaultColor(createColor(75,55,175));

ArrowDN.HideBubble();

ArrowDN.HideTitle();

# Alerts
Alert(ArrowUP, " ", Alert.Bar, Sound.Chimes);
Alert(ArrowDN, " ", Alert.Bar, Sound.Bell);
# End Code