I'm not familiar with RIO (as it's not what I work with) that much, but the error code's definition seems to be pretty easy to understand.
You might think of posting in another forum, possibly the LabVIEW one http://forums.ni.com/ni/board?board.id=170 to get some more exposure.
The answer looks like the information that I need. This is the only return when searching for "ERROR code -61073." Sadly the link is dead! 😞
I had the same problem.
The solution is simple. Memory reserved for the data was too small in relation to their counts. Parameter "depth" must be greater than "number of elements".