Error- 50405 occured at DAQmx Write(Digital Bool 1Line 1Point).vi:2

[Johnair]

Hi, 

I'm using the NI USB-6211 Bus-Powered 16-Bit, 250 kS/s M Series Multifunction DAQ, to control a shutter and Galvo mirrors. And I get the following error:

Error- 50405 occured at DAQmx Write(Digital Bool 1Line 1Point).vi:2

Possible reason(s):

No transfer is nin progress becasue the transfer was aborted by the client. The operation could not be completed as specified.

Task Name:_unnamedTask<3>

It's occurence seems to be random and occurs anytime from a few seconds to 9+ minutes. Is there anybody that could help? 

Thanks,

John Air

[Johnair]

Here are some of the PC details if anyone cares:

Microsoft Windows XP

Home Edition

Version 2002

Service Pack 3

Dell Latitude  LAT2110

Intel (R) Atom (TM)

CPU N 470 @ 1.83GHz