That's the Nikon error message for a lens with aperture ring set to something other than the minimum (i.e. highest number).
The camera insists on controlling the aperture ring, and to do so, the ring must be set to the minimum setting.
Unless it is a "G" lens, which has no aperture ring whatsoever.
The camera body sets the aperture of the lens wide open while
auto-focusing, and displaying through the viewfinder. When it comes
time to flip the mirror up and take a picture, the camera dials the
aperture to the setting you (or the camera) have selected.
ERR
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