I am entirely new to Revit and the SDK to be honest. So I hope I can get your code to run. LoadFamilySymbol normally has 4 arguments. At least in 2016. although one of them indeed seems optional. In this example from 2011: http://thebuildingcoder.typepad.com/blog/2011/05/loading-only-selected-family-types.html only two arguments are passed, one of which is of Family type. The other things that I ran ino myself yesterday was that of the two dll's containing a FamilySymbol type, but that was probably not the case in 2014 because I took my code from another example from Jeremy Tammik.
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