The 300mm lens would not work when attached to the

You didn't specify which Sigma 70-300mm lens (Sigma has at least five different versions, and I'm not referring to the lens mount), but from the error message I assume the lens has an aperture ring. Turn the aperture ring to its smallest setting (largest f/number) and lock it in place. Control the aperture from the camera, the same way as on a lens without an aperture ring.

If the lens doesn't have an aperture ring, please reply to this post specifying the exact model of the lens. That's all of the numbers and letters around the 70-300mm, like AF, DGO, f/4.5, etc.

clean the connection surface using pencil eraser heads. on both lenses and camera.

Sigma make this lens with different mountings (i.e. Canon, Nikon, Sony/Minolta, Pentax and Sigma). So, if you get this lens with the Canon mounting - yes it'll work with your D60. Any other mounting will not fit on your camera. Hope that helps

Set the ISO as high as it will go and the aperture as low as possible. That is as good as it gets without investing a lot of money in pro cameras and lenses that are needed to shoot action in low light. I have a D300 and a 70-200mm f2.8 lens that together cost almost $4000 and it can barely do it. How bad do you want pictures?

This lens has a motor fitted to it to work on a D60 have you moved the A/M switch to M if not the lens is faulty and will need repair

first check if you lens is compatible with the camera.
is your camera a digital or film camera?
this lense is designed for a film camera and is discontinued

Oh, dear! You have a number of options open to you, depending on how you ordered/purchased your lens:

1. If you ordered your lens WITHOUT specifying that it was for Nikon, you may be stumped - unless you contact your seller and explain; they may, then, accept the lens back in exchange for the correct item. I realise that this will be costly on added shipping costs, though.

2. You could sell the lens you have just purchased (on eBay, for instance), then order the Nikon-fit lens from the original supplier.

3. Order a lens converter from the likes of SRB~Griturn. This is likely to be more expensive, though, than the above solutions as a bespoke adapter will probably have to be manufactured. As you are talking about an AF rather than a manual lens, it will cost heaps more!

Good luck; I hope it all comes good for you!

Yes the new nikon D60 needs lens with a built in a/f motor. Your lens will go on and work but you will
have to manual foucs

It should work on the D50, D70, D70s, D80 etc. ( the exceptions are the D40, D40X & D60, no autofocus)

Autofocus function on the D40 only supports lenses with the
AF-S feature, which have an autofocus motor built into the lens,
instead of using an autofocus motor drive built into the camera.

The Tamron lens you have, does not have a built in motor and
the autofocus function relies on the motor drive in the camera.

It will not work with the D40 or D60, but it will work with other
Nikon digital SLRs, such as the D80. Need to get an AF-S
type lens or upgrade to different Nikon digital SLR. Unless
you do this, you will have to manually focus the Tamron lens.

All of the Nikon DX (for digital) series lenses are also AF-S
type, so they will work with the D40, which is designed as
an entry level digital SLR, therefore it is intended primarily
for use with DX lenses, which are typically sold in a kit with
the D40. Most common one is Nikkor 18-55mm DX AF-S.

Other Nikon AF-S lenses made for film cameras (FX type)
will also work with the D40, but these tend to be expensive
professional models. DX series lenses tend to be more
affordable. You might consider the 18-200mm DX AF-S
as an alternative to the Tamron, but these are not cheap.