Unhandled exception: Exception has been thrown by the target of an invocation.

[llanqui]

I'm getting this error

Unhandled exception: Exception has been thrown by the target of an invocation.

and it seems it is coming from this code...

else if (State == State.Realtime)
{

ChartControl.Dispatcher.InvokeAsync((() =>
{

chartWindow = Window.GetWindow(ChartControl.Parent) as Gui.Chart.Chart;

if (chartWindow == null)
return;

accountSelector = chartWindow.FindFirst("ChartTraderControlAccountSe lector") as AccountSelector;
accountSelector.SelectionChanged += accountSelectorChanged;

}));

}

this started happening recently...don't know what changed?

from what I remember the AccountSelector object is not instantiated before Stata.Realtime

and if the Dispatcher is not used, there is a thread error

how to fix?

??.

[llanqui]

When this happens the Account Selector on ChartTrader has no Account. It is blank.

[llanqui]

this happens when the workspace is open before the connection is made

when I boot ninja normally all the workspaces I need are opened before the connection happens

if I open the workspaces after the connection is made, then I don't get this error

[llanqui]

I have three Apex accounts and two SIM accounts...

[llanqui]

the apex accounts have just one login userid /password

[NinjaTrader_ChelseaB]

Hello llanqui,

With some small changes I'm not able to reproduce when testing this code.

Below is a link to a video demonstrating.

https://drive.google.com/file/d/1p7eppUzqQURhBcnK7lGG5zsiLBUR7_oA/view?usp=drivesdk

You may find the example linked below helpful.

https://support.ninjatrader.com/s/article/Chart-Trader-UI-Elements-from-Automation-IDs

[llanqui]

I will move the code to State.Dataloaded like in the example and see what happens...but if I remember the AccountSelector is null before the Accounts are connected...

??

[NinjaTrader_ChelseaB]

Hello llanqui,

The AccountSelector should not be null if the ChartControl is not null as this is the WPF Control in the window.

The AccountSelector.SelectedAccount will be null if there is no account selected.

[llanqui]

I found the problem.

In the Trace file the dump showed I was referencing a null object (of my own) in the AccountSelectorChanged script

that method apparently is triggered when the account selected goes from null to the default account when a connection is established