What lens do you have attached? If it's an older lens with the electronics, the camera will not be able to communicate with it and thus report lens not attached. You can switch to manual mode and still use the lens, but you'll have to set the exposure without any assistance from the camera's light meter.
It it is a more modern lens with the electronics, try cleaning the contacts on the back of the lens and in the mount on the body.
For Nikon AF and manual focus SLRs. The compatible T Mount System makes it possible to use most any single lens reflex camera in combination with various front camera attachments such as telescopes, mirror lenses and slide duplicators. The T Mount is a metal connector that screws onto the compatible front attachment and allows this combination to be coupled to the SLR camera lens mount.
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