HP 3852A;ERROR 18: SYSTEM ERROR-> how to resolve this error?

[Alain_de_C]

from a vi, I enter a command to communicate with the unit hp3852A : "CONF MEAS TEMPK, 502"
And the unit HP3852A show me an error: #18 internal processor is in an illegal state.
Yesterday, I did not have this problem, and I never move the instrumentation for the lab I work.
How can I resolve this error? Because that's the only command which doesn't work-> CONF MEAS ...(whenever the type of the measurement, DCV,OHM,TEMPK)
here is a piece of code attached (look at the frame 0)
thank you for response.

[Dennis_Knutson]

The first thing you should do is wire up the error in/error out connections of the gpib functions and check for any errors. At the same time, this will enable you to eliminate the sequence structure and all of those local variables. Since it is the instrument that is displaying the error, it would appear that you've incorrectly programmed it. It might be an illegal command or the write buffer is full. You might want to add a few error queries to the instrument to see when it happens or test your commands in the interactive enviroment of MAX. There is also a driver available for the instrument. Check your LabVIEW Instrument Driver CD or download it here.