Try with const string in timestamp()
drawVerticalLine(targetTime) =>
line.new(
x1 = targetTime,
y1 = low,
x2 = targetTime,
y2 = high,
xloc = xloc.bar_time,
extend = extend.both,
color = color.new(#f9961e, 10),
style = line.style_solid,
width = 1)
// Lines to Plot//
targetTime = timestamp('2025-03-24 06:54 GMT+0')
drawVerticalLine(targetTime)
