Machine Learning Extractor - Array of ExtractionResults

Hello Guys,
I would like to store the ExtractionResults of the Machine Learning Extractor into an array and then go through the whole array with a “Present Validation Station” activity.
I tried to simply define a variable as an array of ExtractionResults but the Machine Learning Extractor fails. Am I missing something?

Thank you!

RemoteException wrapping System.NullReferenceException: Object reference not set to an instance of an object.
at System.Activities.ExpressionUtilities.ArrayLocationFactory1.ArrayLocation.set_Value(T value) at System.Activities.Location1.ReferenceLocation.set_Value(T value)
at System.Activities.ActivityContext.SetValueCore[T](LocationReference locationReference,
T value)
at System.Activities.ActivityContext.SetValue[T](OutArgument1 argument, T value) at System.Activities.OutArgument1.Set(ActivityContext context,
T value)
at UiPath.IntelligentOCR.Activities.DataExtraction.DataExtractionScope.<>c__DisplayClass49_0.b__4(NativeActivityContext endContext)
at UiPath.Shared.Activities.AsyncTaskNativeImplementation.BookmarkResumptionCallback(NativeActivityContext context,
Object value)
at UiPath.Shared.Activities.AsyncTaskNativeActivity.BookmarkResumptionCallback(NativeActivityContext context,
Bookmark bookmark,
Object value)
at System.Activities.Runtime.BookmarkCallbackWrapper.Invoke(NativeActivityContext context,
Bookmark bookmark,
Object value)
at System.Activities.Runtime.BookmarkWorkItem.Execute(ActivityExecutor executor,
BookmarkManager bookmarkManager)

Hi @dimdim

As of now pass the extraction of results in string and then try to print the values and then assign the values in an array


Hello @AshwinS2

Thanks for the reply! I just realised I made a mistake in my code.
I just have to create a collection of ExtractionResults (New List(of ExtractionResult) and add them to the List using “add collection” activity.
I then create 3 additional lists to store DocumentText (type string), DocumentObject (type document) and DocumentPath (type string).
The Validation Station can then work peacefully through the different lists.


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