Unable to Render Smoke

Hi guys,
I have a problem with the smoke simulator. I tried to make a flame thrower, the preview in viewport was great, i have baked it too, but after I hit render, the smoke won’t appear.

My viewport

After I hit render with spot lamp outside

After I hit render with spot lamp inside

Could you tell me what’s going on and how to solve it? (I’m using Blender 2.58a)
Thanks for the answer.:rolleyes:

did u give the smoke a texture?
if u didn’t watch BlenderGuru’s explosion tutorial

Which one do I have to texture, the particles or the domain?

Watch this tutorial

thanks, i’ll try that