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I want to use "IMAQdx open camera.vi" in my project. But when I use this vi or another IMAQdx vi in llb manager, they don't work because of the error "polymorphic terminal cannot accept this data type" as shown in the figure. I don't remember whether I changed the vi, but I cannot undo it now if I changed. It opens as shown in the figure.
Can you reinstall the vision acquisition software? It is very risky to change anything from vi.lib, and will cause many problems when moving projects to a new computer.
Please attach the VI from your code where this function is called -- this should be the actual VI, not another picture. You might also attach a picture from MAX showing the Devices to show us the Camera -- I assume that if the Camera is attached to Cam3, your VI specifies Cam3 as the Session In parameter.
Here's a MAX screenshot + snippet of a very tiny VI illustrating that IMAQdx Open does work on my PC ...