ROI when using IMAQdx

Hi, 

I am trying to control a camera (FLIR, Grasshopper 3) via LabView, using IMAQdx. I can get it to work with default settings but when I try to change the ROI, I get an error message that 'the attribute value is out of range'. 

 

I get the message when I try to change the width to under 2000 pixels or offsets to any value other than 0. Changing height seems to work fine.

 

 

The ROI adjustment works fine in NI Max but on switching to Labview VI, I get the error. So, I guess it has probably something to do with my way of calling the IMAQdx property node?

 

Any help/suggestions would be very useful. 

 

Thanks