Draw.ArrowLine

[dv926844]

Hi, I have a function which draws an arrow in left top corner of chart

barsPainted = ChartBars.ToIndex - ChartBars.FromIndex;
height = chartScale.Height/16;
width = chartScale.Width/32;

Draw.ArrowLine(this, "myArrow", CurrentBar-ChartBars.FromIndex-(barsPainted/32), chartScale.GetValueByY((float)(height+height/64)), CurrentBar-ChartBars.FromIndex-(barsPainted/32), chartScale.GetValueByY((float)(height+height*2)), Brushes.Red,DashStyleHelper.Solid, 7);

On my first PC it works perfectly but on my second PC it throws an "object reference not set to an instance of an object". I can't find why does this exception occures only o second PC.

Update: PC which does not work has windows 7 OS

Update 2: Error looks like: "Error on calling 'OnRender' method on bar 5546: You are accessing an index with a value that is invalid since it is out-of-range. I.E. accessing a series [barsAgo] with a value of 5 when there are only 4 bars on the chart."
while currentBar = 5545, why does OnRender method trying to recive non exist bar

[JerryWar]

What is the OS on the working version ?
Not that this has fixed it in my Case but Have you updated your video
card drivers on the Win7 version ?

[NinjaTrader_AlanP]

Hello dv926844,

Could you please send an email to platformsupport[at]ninjatrader[dot]com with Attn: Alan P in the Subject line. Also within the email please include a link to this thread, and attach the log and trace files for the day in subject which you can find in My Documents>NinjaTrader8>Log and My Documents>NinjaTrader8/Trace folders.

I look forward to your email.