PropertyKeyed Collection not valid

[trader123456789]

Hi, I've been having nothing but deadlock/writelock/freezing issues ever since the FORCED upgrade to 8.0.28. It's very frustrating as I'm a scalper and this issue is causing me to miss trades.

NT8 is saying it's a 3rd party indicator. The devs of the 3rd party indicators are saying it's NT8. As the consumer with no technical experience, I'm MORE than frustrated at this point.

I wrote to support previously and, of course, got a copy and paste answer that doesn't work or help in any way, shape, or form.

Today I got a NEW error message that states:

"Unhandled exception: 'Newtonsoft.Json.Linq.JPropertyKeyedCollection' is not a valid value for property 'Background'"

Can someone PLEASE tell me what this means?

[NinjaTrader_JustinD]

Hello trader123456789,

Thank you for using NinjaTrader.


In regard to your other request with our team, sometimes a change to NinjaTrader after an update can cause issues with scripts/add-ons, meaning developers may need to update the script to remain compatible with the platform. If an error has been isolated to a 3rd-party script, and the developer of your script is unsure how to resolve a specific issue after the update, please let them know that they can reach out to our team directly for assistance to ensure all their scripts work on the newest version by emailing [email protected].

For the error message you included from today, we can confirm if this is coming from an add-on or if it is an issue with a built-in function using the Safe Mode test. Safe Mode will prevent NinjaTrader from:

• Loading workspaces and connecting on start-up.
• Loading custom assemblies (3rd-party add-ons and NinjaScripts)
• Getting instrument updates from the server

To open the platform in Safe Mode:

• Go to the Windows Start Menu
• Search for NinjaTrader > select 'NinjaTrader (Safe Mode)'
• Once you have opened the platform in Safe Mode, you may manually connect to your Data Provider

Please open a new chart with no custom bar types/indicators/templates and test for issues. Does the error message persist on this blank Workspace in Safe Mode?

If not, please try opening your previous workspace from the Control Center > Workspaces drop-down. It may already appear as open. Hit 'close' and do not save, then re-open it again for your windows to appear. You will notice that no 3rd-party add-ons are available in Safe Mode. Does the behavior return to your regular Workspace in Safe Mode?

If not, restart NinjaTrader normally, and test for the behavior on your Workspace normally once more with your 3rd-party add-ons available. If the issue returns, we suggest rebuilding your workspace and keeping track of each add-on you implement to identify the cause of the error should it return. If the issue does not resurface, it confirms the error was isolated only to your other Workspace.

We also suggest backing up your workspace (Tools > Export > Backup) so you may restore a working version if the issue returns. Additional information about backups may be read here in our NinjaTrader Help Guide - Backup and Restore

Please let us know the results of this test. We look forward to your response.