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Is it possible to delete Arrowhead types?
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var arrowHeads = new FilteredElementCollector(doc).WhereElementIsElementType().Cast<ElementType>().Where(t => t.FamilyName == "Arrowhead").ToList();
using (Transaction trans = new Transaction(doc, "Remove Arrowhead"))
{
trans.Start();
foreach (var arrowHead in arrowHeads)
{
doc.Delete(arrowHead.Id);
}
trans.Commit();
}
Throws an Autodesk.Revit.Exceptions.InternalException: 'An internal error has occurred,' and then Revit crashed