That node requires Revit.Elements.warningElement as input. Currently you’re using Revit.Elements.FamilyInstance:
Write a python script and use Document.GetWarnings() method. Checkout the RevitAPI Docs:
http://www.revitapidocs.com/2018/4774613d-600a-e1b5-b5aa-f1ee3b14394c.htm
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