Workflow to update item field metadata

Hi, I'm new to the SP Workflow world.

I'm trying to update metadata field in every new item created in a document library via web service call.

I've developed a workflow like this: https://www.c-sharpcorner.com/article/update-managed-metadata-field-using-sharepoint-designer-2013-workflow/ .

The workflow works fine, the item field is updated in the library page, but than the WF become suspended. I found the error is in the web service call (because after that the WF should send me an Email and it doesn't happen).

Looking at the WF status, this error message appears: An unhandled exception occurred during the execution of the workflow instance. Exception details: System.InvalidCastException: The value 'd/results(0)/Family' cannot be read as type 'String'. at Microsoft.Activities.GetDynamicValueProperty`1.CheckedRead(String propertyName, DynamicItem value) at Microsoft.Activities.GetDynamicValueProperty`1.Execute(CodeActivityContext context) at System.Activities.CodeActivity`1.InternalExecute(ActivityInstance instance, ActivityExecutor executor, BookmarkManager bookmarkManager) at System.Activities.Runtime.ActivityExecutor.ExecuteActivityWorkItem.ExecuteBody(ActivityExecutor executor, BookmarkManager bookmarkManager, Location resultLocation) Exception from activity GetDynamicValueProperty Sequence DynamicActivity FormatString Stage 1 Sequence Flowchart Sequence Autotag HOT.WorkflowXaml_ffd1ba7a_d9cf_47e9_b304_4ea16e106f4b 

Where "Family" is my metadata field (single term managed metadata).

So I don't know why it's suspended, I followed precisely all the steps...

Any answers or tips?

Thank you

 

GC