It looks like you are using the NI IVI Class Drivers, and have configured them to use the Agilent IVI-C driver under the hood. For some reason, it looks like the class drivers aren't happy with the Agilent driver, and that's the cause of the error.
You should first confirm your IVI configuration in MAX. You should make sure IVI Logical Name is pointing to the right Agilent driver, correct instrument address, etc. That name is what you pass into Initialize with Options.
If this doesn't pan out, it looks like you'll have to debug things.
First of all, do you need to use IVI? If not, then I'd recommend you download our LabVIEW instrument driver for this instrument, so that you can get LabVIEW source code.
It's available on http://ni.com/idnet/ at
href="http://zone.ni.com/idnet97.nsf/9b2b33e1993d877786256436006ec498/539916348394adc7862568ab005fbb....
If you do need IVI, then I'd suggest you try NI's IVI-C driver for this instrument, also on http://ni.com/idnet/ at
this link. This includes LabVIEW Wrapper VIs for the driver.
If you want to use Agilent's driver, did they provide LabVIEW support with their driver? That is, did they include LabVIEW wrapper VIs? If so, you might try just calling the "AGE4437B InitializeWithOptions.vi" directly and see if you get an error. If they did not provide wrapper functions, I'd call them up and ask if they can give them to you.
I hope this helps. Let us know what you figure out.
Brian
