Assign automatic weights from bones does not work at all for me I'm trying to make the tutorial called "Eye Rigging in Blender" found here :

https://www.youtube.com/watch?v=CCGekumdLLU

and it get a different result from the one reached on the tutorial. From minute 15.06 to minute 17.13 the author press W and then assign automatic weights from bonesand magically for every bone has been assigned a small colored area. But this does not happen to me,even if I have repeated a lot of times what he did. Can you explain to me why ? I add a small recorded video to show you what I do so you can understand where I'm wrong :

video : what I do
To solve bone heat weight failed issues:

1) remove doubles

2) disable bone deformation for bones that wont be deforming the mesh directly

3) apply location/rotation/scale for the armature and the mesh

4) apply the automatic weights