Errors 410 and 420 with Agilent 34970A

[Arrington]

Hello, all.  I'm helping a colleague with an application measuring ten
channels each of temperature, frequency, and current using an Agilent
34970A DAQ switch (GPIB) and LabVIEW 7.  We keep getting errors 410
and 420 from the switch.  When the error occurs, then the switch
doesn't report all 30 pieces of data.  I'm looking for ways to a)
clear the error; and b) prevent the errors.
Thanks in advance,
-Dan A