Can't render smoke in Cycles

I tried to make smoke with this tutorial :
I see the smoke and the fire in the 3D view but when I render it I don’t see anything… Just the white sphere that is the flow object.
Why can’t I see it in the render?

Are you using a Buildbot version of blender? The official version doesn’t render smoke yet?

Umm… I’m using the official 2.70 version.
So what version should I use?

Read the actual tutorial description and watch the video and it’ll tell you !

I can’t believe I missed it, I feel like an idiot lol. Thank you

Now what was the solution? I have the same problem.