InvalidOperationException-error-when-changing-to-All-Data

Strategy was running fine. Received these error messages after changing to "All Data":

System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
at System.Collections.Generic.List`1.Enumerator.MoveNextRare()
at System.Linq.Enumerable.SelectListIterator`2.MoveNext()
at System.Linq.Set`1.UnionWith(IEnumerable`1 other)
at System.Linq.Enumerable.DistinctIterator`1.FillSet()
at System.Linq.Enumerable.DistinctIterator`1.ToList()
at WealthLab.Backtest.BasicScoreCard.Initialize(Backtester bt)
at WealthLab.Backtest.MetricsBundle.GetMetric(String metricName)
at WealthLab.Backtest.MetricsBundle.TryGetMember(GetMemberBinder binder, Object& result)
at CallSite.Target(Closure , CallSite , Object )
at WealthLab7.visEquityCurve.PrepareDispatcher(Object task, MouseEventArgs selection)
at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
at System.Windows.Input.InputManager.ProcessStagingArea()
at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at System.Windows.Interop.HwndSource.InputFilterMessage(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.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)