Error message

[AgriTrdr]

I received this below error message for the first time in Ninjascript Output Window. What could be the reason why this is triggering?

Market analyzer column 'Realized profit loss': Error on calling 'OnAccountItemUpdate' method: Collection was modified; enumeration operation may not execute.

[NinjaTrader_Emily]

Hello AgriTrdr,

Thank you for your post.

Please be sure that you have added event handlers to subscribe to account item updates. Additionally, it is important to remove the event handler as cleanup when the script terminates. As a test, are you able to reproduce this message using the code shown in the help guide for AccountItemUpdate? Here is the link:

https://ninjatrader.com/es/support/helpGuides/nt8/accountitemupdate.htm

Another item that may cause this type of error is creating a collection of items, such as a list, and the collection is changed/modified in flight. An example is trying to loop through a list, and the list is updated while the loop is in progress. Something you could do to prevent this is to make a copy of the list with ToList() and then loop through the copied list.

Please let us know if we may be of further assistance.