Exceptions-at-WealthLab-WPF-DataSetTreeView

Hello, while still running some 3 algorithms in my IB advisor demo account, I am faced with the same pop up exceptions each day. I am not sure how to start debugging these, but I am stuck not being able to move further. Here is an exception occurring once.

System.NullReferenceException: Object reference not set to an instance of an object.
at WealthLab.WPF.DataSetTreeView.EnableInvocation(TreeNode last, DataSetProviderBase pol)
at WealthLab.WPF.DataSetTreeView.<>c__DisplayClass27_0.PostEvent()
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)

Here is an exception occurring 3 times, presumably related to the 3 algorithms.

System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. (Parameter 'index')
at WealthLab.WPF.DataSetTreeView.EnableInvocation(TreeNode last, DataSetProviderBase pol)
at WealthLab.WPF.DataSetTreeView.<>c__DisplayClass27_0.PostEvent()
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)

The log shows no errors, but algorithms supposed to trigger executions have been consistently showing no signals each day.

I have some highly promising algorithms and need to get them up and running. Where do I start debugging these errors? Thank you.