Receiving an error the SECOND time I run the program

[drosen14]

When I run grab.vi (screenshot attached) to stream from my usb camera, it works great. When I stop the program and rerun, however, I consistantly recieve the error message:

Error -1074396024 occurred at IMAQ USB Grab Setup.vi
  Error system.

IMAQ Vision:  Minimum coverage value should be greater than zero.

The only solution is to restart labview. Why is this? Thanks for your help.

David

[crossrulz]

How are you stopping your program?  With the Stop button or the Abort VI button?

Typically, when things like happen it is because drivers were not closed properly.

[drosen14]

I receive the same error regardless of whether I use the stop button or the abort VI button.

-David

[Zwired1]

I haven't used vision so apologies if this is way off, but it looks like you are opening a reference, starting the camera, stopping the camera, but not clearng the reference...?

Another possibility is the while loop is iterating a bunch of times, and "enqueueing" a bunch of "take picture" events.  Try removing the while loop (for troubleshooting purposes).

[0utlaw]

Hello drosen,

What version of LabVIEW and IMAQ are you using?  IMAQ for USB was deprecated and replaced by IMAQdx in 2009; it sounds like you may be running into one or more of the errors described here:

White Paper: NI-IMAQ for USB Cameras

http://www.ni.com/example/30030/en/ 

The most recent version of the Vision Development Module (which includes IMAQdx) can be found here:

http://search.ni.com/nisearch/app/main/p/bot/no/ap/tech/lang/en/pg/1/sn/n8:2037,ssnav:pdl/q/imaq/ 

Regards,