Crashing based on

Hi,

I would like help with this date/time error. 

I have the following function defined:

 public DateTime TradingDateTime()
        {
            if (this.IsBacktesting)
            {
                return Server.Time;
            }
            return TimeZoneInfo.ConvertTime(DateTime.Now, TimeZoneInfo.Local);
        }

But, when I call this onBar with the following code:

 DateTime toda = TradingDateTime();
 DateTime today = toda.Date.AddHours(-7);

 int lastBarIndex = MarketSeries.OpenTime.GetIndexByTime(today) + 1;

I get the following error:

15/08/2019 11:50:00.900 | Crashed in OnBar with ArgumentException: The conversion could not be completed because the supplied DateTime did not have the Kind property set correctly.  For example, when the Kind property is DateTimeKind.Local, the source time zone must be TimeZoneInfo.Local. Parameter name: sourceTimeZone

What am I doing wrong here?