BFFA0001 with the hpe3640A getting start example

[GRATTAEVINCI]

I'm trying to automatically step by 50 mV each time the E3640A agilent DC power supply. I'm doing this with a time loop in which every second I update the voltage level input of the example vi which comes with the driver (version 2.4). I constantly obtain the following error: HEX 0x BFFA0001. This I found it does not depend on my loop, but I also have when running the example stand alone (no loop). Even though there is this error, I found the loop can proceed correctly but the time is not more correct (it takes more time when the error occurs). I'm wondering what is it the problem...any feedback will be greatly appreciated.

Regards

I attach the loop in case it is needed

[gagi1]

Since you are getting the following error: "BFFA0001 Instrument error detected. Call the Error Query VI and examine the error.", there is probably a command that is being sent to the instrument which the instrument does not understand. You should run NI-Spy to see which command fails.