Thanks for your answer Hugo.
Those are the two lines that gives me the error:
camera = nuke.createNode("Camera2")
k = nuke.Array_Knob("ref_frame", "ref_frame")
camera.addKnob(k)
I'm actually using an Int_Knob and it's working but I'm interested in
understanding why it doesn't work with the Array_Knob
Thanks
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