Error 1055 occurred at Property node

[RichLamb]

Generating the error:

"Error 1055 occurred at Property Node in ...   Possible reason(s):  LabVIEW object reference is invalid."

when I try to wire the IMAGE OUT output from the IMAQdx Snap vi to the value property of an externally referenced image display control.

To describe in more detail, I have a parent vi with an image display control and a child vi which has a control refnum linked to the parent vi display. In the child vi I create a value property for the refnum and try to write images to it, essentially to drive the parent display from the child vi.

The technique works elsewhere, though I can't think of what I could have done differently to generate this error?

[MikeS81]

Hi RichLamb,

can you upload your vi´s?

Mike

[RichLamb]

Hi Mike - looks like I may not need to. I've been working away at this and have found the original cause and something else a bit weird...

I deleted the objects from the sub-VI that was giving me errors, then cut and pasted the objects (image display refnum and value property) from a VI that was working and this solved the problem. So you might think that the issue was just some obscure configuration item, or I'd used the wrong type in my reference or something.

I found the display reference in the parent VI was not even wired to the sub VI - duh! Error between keyboard and chair. So at least the original error message made sense, but I have no idea why it actually worked after pasting in the new objects. Are these references using some sort of auto-magic? Who knows. Safer to wire up my sub-VI's properly methinks.

Sorry for wasting forum time on this one.