Adding to DateTime throwing error

[rickesh]

I am trying to add the timeframe period to a DateTime (see StartTime.AddMinutes(timeframe)) to achieve the outcome in the screenshot below using the following code and I get the following error. " Error on calling 'OnBarUpdate' method on bar 71: You are accessing an index with a value that is invalid since it is out-of-range."

Oddly the code works on the M1 timeframe, giving the desired result, but does not work on the 5 min onward etc. I am an amateur coder so I can understand if the following code is not the best way of doing the job but any help would be appreciated.

// if barsinprogress == 1 then we are using the series from state.configure. If this isnt true, end the program
if (BarsInProgress != 1)
{
    return;
}

// current DT gives time of the current bar
DateTime current_dt = Times[1][0];



for (int i = 0; i < starttimeslist.Count; i++)
{


    // convert session time into a full DateTime for further use
    DateTime sess_StartTime = new DateTime(current_dt.Year, current_dt.Month, current_dt.Day, starttimeslist[i].Hour, starttimeslist[i].Minute, starttimeslist[i].Second, DateTimeKind.Local);
    DateTime sess_EndTime = new DateTime(current_dt.Year, current_dt.Month, current_dt.Day, endtimeslist[i].Hour, endtimeslist[i].Minute, endtimeslist[i].Second, DateTimeKind.Local);


    // if we're in session, do the following, else we are no longer in session and end the function
    if (sess_StartTime < current_dt && current_dt <= sess_EndTime)
    {
        int StartBar = CurrentBar - Bars.GetBar(sess_StartTime.AddMinutes(timeframe));
        double BarOpenPrice = Open[StartBar];

        // items for the line # non essential to code
        String tag = GenerateTodayTag(current_dt);
        SimpleFont TextFont = new SimpleFont("Verdana", 9);


        // the drawing of the lines themselves

        Draw.Line(this, " OL" + tag + nameslist[i], false, sess_StartTime.AddMinutes(timeframe), BarOpenPrice, sess_EndTime, BarOpenPrice, Brushes.White, DashStyleHelper.Solid, 1);
        Draw.Text(this, "OL Text" + tag + nameslist[i], false, nameslist[i] + " " + 12, sess_EndTime, BarOpenPrice, 12, Brushes.White, TextFont, TextAlignment.Right, null, null, 100);
    }


    if (sess_StartTime < current_dt && current_dt <= sess_EndTime)
    {
        return;
    }
&#8203;​ 

[NinjaTrader_ChelseaB]

Hello rickesh,

The error is an invalid index error.

An index you are using is invalid.

Below is a link to a forum post on indexing errors.

https://ninjatrader.com/support/forum/forum/ninjatrader-8/indicator-development/1046200-indicator-that-calculate-in-different-chartime?p=1048513#post1048513

Any index used must be less than the size of the collection. For a series or a drawing object, any barsAgo index must be less than CurrentBar.

Use prints to find the invalid index.

Print the value of the index 'i' and print the value of CurrentBar and ensure that the value stored with 'i' is less than CurrentBar.