Hi mark6i,
I would be surprised if this problem hasn't been fixed in a newer version of LabVIEW. Any possibility that you could upgrade?
If you can't upgrade LabVIEW, I've also seen instances where upgrading device drivers that are used in your program (such as NI-Serial, NI-4882, NI-VISA, etc.) can make this error go away. If you are using any of these packages, I recommend you visit our Drivers and Updates page and see if any newer versions are available for download.
National Instruments - Drivers and Updates
Eric V
National Instruments
Applications Engineer
Certified LabVIEW Associate Developer
"I'm a Ramblin' Wreck from Georgia Tech and a helluva (NI Applications) Engineer!"