Nt8-B5-Exception: collection was modified; enumeration operation may not execute

[sledge]

I did the same exact thing on another machine and did not get this.

All I did was Create a new workspace, and closed the old workspace.


2015-09-26 18:21:03:105 Starting server message polling timer with interval 300 seconds...
2015-09-26 18:21:23:226 *************** unhandled exception trapped ***************
2015-09-26 18:21:23:226 Collection was modified; enumeration operation may not execute.
2015-09-26 18:21:23:239 System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
at System.Collections.Generic.List`1.Enumerator.MoveN extRare()
at System.Linq.Enumerable.<OfTypeIterator>d__aa`1.Mov eNext()
at System.Linq.Enumerable.Count[TSource](IEnumerable`1 source, Func`2 predicate)
at NinjaTrader.Gui.Chart.Chart.<>c__DisplayClass46_0. <HookEventHandlers>b__8(Object sender, EventArgs args)
at System.EventHandler.Invoke(Object sender, EventArgs e)
at NinjaTrader.Gui.Tools.NTWindow.OnClosed(EventArgs e)
at System.Windows.Window.WmDestroy()
at System.Windows.Window.WindowFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at System.Windows.Interop.HwndSource.PublicHooksFilte rMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation( Object o)
at System.Windows.Threading.ExceptionWrapper.Internal RealCall(Delegate callback, Object args, Int32 numArgs)
at MS.Internal.Threading.ExceptionFilterHelper.TryCat chWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)

[NinjaTrader_EricB]

Hello sledge,

Thank you for your post,


So I may test on my end, can you please attach the log and workspaces from where/when this occurred?

I look forward to assisting further.

[sledge]

NT8B9

slightly new take:

2016-02-25 03:51:52:785 (Playback Connection) Cbi.Account.PositionUpdateCallback: instrument='ES 03-16' account='Playback101' avgPrice=0 quantity=0 marketPosition=Flat operation=Remove
2016-02-25 03:51:52:785 *************** unhandled exception trapped ***************
2016-02-25 03:51:52:785 Exception has been thrown by the target of an invocation.
2016-02-25 03:51:52:786 System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
   at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
   at System.Collections.Generic.List`1.Enumerator.MoveNextRare()
   at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext()
   at NinjaTrader.Gui.NinjaScript.StrategiesGrid.CalculateRealizedProfit(StrategyBase strategy, Instrument instrument)
   at NinjaTrader.Gui.NinjaScript.StrategiesGrid.<OnPositionUpdate>b__66_0(PositionEventArgs e)
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
   at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
   at System.Delegate.DynamicInvokeImpl(Object[] args)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
2016-02-25 03:51:52:968 (Playback Connection) Cbi.Account.AccountItemCallback: account='Playback101' accountItem=CashValue currency=UsDollar value=*****