Hello;
It's hard to give you advise without seeing the code you are trying, however, you can test that out yourself by using the Labview shipping example for Analog Output as your benchmark.
Start with that one and see if the same error shwos. If it does, your board is most likely defective. If it doesn't, try to cross check both the example VI and the VI you wrote for diferences. In that case, the probem will most likely be on your example VI.
Regards
Filipe A.
Applications Engineer
National Instruments