Well the new error would be because you are attempting to read from an output task. That ain't gonna work. Period! There is a flaw in your understanding of what a DAQ device is. I encourage you to read the DAQmx Help file and look through this Knowledge Base article to get a better grasp of the underlying concepts. Then go through the LabVIEW example finder
Of course your vi HAS a example icon. but at least you renamed it so the original should still be safe somewhere.
You basically made the same mistake again. You are expecting the DAQmx Driver will just <Swish> hardware into existence when in fact its PRIMARY job is to tell you that the existing hardware will not work that way (by throwing an error if you attempt to do something the hardware is not available to do like: Attempting to read the values from an AtoD converter when there is no such physical connection between an AO line and the devices AtoD circuitry)
As far as the file IO goes. you got waveforms
one of these might help