Why does one of my objects disappear when I render? I'm new to Blender and I finished one scene. Everything is good when I look at the scene in the object mode or rendered preview, but when I actually render the scene, my doughnuts disappear and the icing starts looking very sharp and edgy. Please, look at the attached images.
Could someone tell me what I'm doing wrong?
My assumption is that it is hidden from the render. Go to the outliner and make sure that both the eye and camera aren't grayed out. 



Otherwise make sure that all of the following optios are checked (make sure object is selected).


Edit

Icing:

In the modifier tab make sure render of the subdivision-surface is same as view.: