I'm getting an 'Chart rendering failed' error while running my strategy.

[Andreas189]

Hello,

I made a new strategy and it works fine. But sometimes it get error messages

Chart rendering failed. There is likely a problem with a chart object's OnRender method. D2D error = 'HRESULT: [0x88990016], Module: [SharpDX.Direct2D1], ApiCode: [D2DERR_PUSH_POP_UNBALANCED/PushPopUnbalanced], Message: The push and pop calls were unbalanced. '

A direct X error has occurred while rendering the chart: HRESULT: [0x88990016], Module: [SharpDX.Direct2D1], ApiCode: [D2DERR_PUSH_POP_UNBALANCED/PushPopUnbalanced], Message: The push and pop calls were unbalanced. '

Most of the time the strategy works fine. I looked here in the forum and saw that it is necessary to send you the trace and log files. Can you please give me a ticket number that I can send you this files for further analyses?

Best Regards
Andreas

[NinjaTrader_ChelseaB]

Hello Andreas189,

Are you able to reproduce this error with the SampleMACrossover included with NinjaTrader in a new empty workspace?

Does the strategy override OnRender()?

Does the strategy call drawing object methods?

Are you using 8.0.26.1? (Help -> About)

[Andreas189]

Hello Chelsea B.,

thank you for your quick response.

• I will try the SampleMACrossover in a new workspace.
• I looked for a string 'OnRender' but no results.
• Yes, my strategy calls some drawing tools.
• I'm using the version 8.0.25.0 I will update it first and give you a feedback asap

Best Regards
Andreas

[Andreas189]

Hello Chelsea B.,

I updated NinjaTrader to the newst version 8.0.26.1 and I'm getting the errors again. I also tried the SampleMACrossover strategy in a new workspace and it works fine (no errors).

Sometimes I also get an error 'Unhandled exception: Object reference not set to an instance of an object.'.

Best Regards
Andreas

[NinjaTrader_ChelseaB]

Hello Andreas,

If the SampleMACrossover is not able to reproduce, then likely the issue is with improper code in the strategy.

Object reference is a variable, not set to an instance of an object mean the variable has a null value.

https://ninjatrader.com/support/forum/forum/ninjatrader-8/strategy-development/1107472-entryorder-null-error#post1107522

What line of code is causing the error?
Comment out the logic in OnBarUpdate() until the error stops. Uncomment until the error returns. What was uncommented when the error returned?

[Andreas189]

Hi ChelseaB,

it took a while but now I have found the bad code and I didn't expeceted that this cause the error.

When I uncomment this 3 lines the Rendering error came back:

...
public override string DisplayName

{

get { return Instrument + " " + BarsArray[0].BarsPeriod + " Chart.";}

}

...

and the call some lines later

...
protected override void OnBarUpdate()

{

Print(DisplayName);

Best Regards
Andreas

[Andreas189]

Hi ChelseaB,

if I use this code:

...
public override string DisplayName
{
get { return Instrument + " " + BarsPeriod + " Chart.";}
}
...

I didn't get an Rendering error.

Best Regards
Andreas

[NinjaTrader_ChelseaB]

Hello Andreas,

The DisplayName is called for the Strategies window and can be called before the strategy is enabled, before the Instrument or BarsPeriod is created.

Use a condition to ensure the Instrument and BarsPeriod are not null.