Object shows up black only in render

I have an object that looks fine except when I render it and then it is completely black. Other objects render just fine. The light source is the default light and it is right above the object so I should see something from it.

Any idea what is causing this?

(I tried uploading the zipped blend file, but it said “Invalid file type”)


Upload just the blend,
I thought it would be a normal problem, is “double sided” checked?
If not, do a CTRL-N anyways, this recalculates the normals. The thing that says which way is up.
And check the lamp settings? you may have turn it on negative.