I am trying to use the Vlookup function in VBA and the lookup is to an
external workbook. I get a runtime Error 9 when setting the lookup range:

Set lookuprng = Workbooks("PRProc").Sheets("Accounts").Range("$a$1 :$f$65000")

Actually, my reference is a named range so I'd rather refer to the name
instead, but not sure the syntax for that either:
Set lookuprng = Workbooks("PRProc").Sheets("Accounts").Range("PRLU Rng")