I think it works if you select elements by the builtin categories, I tried that and works fine except in large project, I suppose when the data to load is huge Dynamo does not want to work and give you that internal error warning, but I am not 100% sure, I tried all the 638 categories of Dynamo for Revit at the same time with try error in a python code, but there was no error, so it must be something else.