Hello, major noob here

im trying to do the starwars ship tutorial, but i cannot get past the second session, when i extrude the wing and turn it from poly to sub-d some edges are not smooth, can someone help me with this?

the geometry is just like in the tutorial but somewhere im doing something wrong ive tried to solve the problem myself and have looked in the forums but its no use..

to get an idea of what i mean here is a pic



thanks