Subsurf help

hey, i’m having trouble with subsurf, i’m making a car model, and every time i trry to smooth the piece it makes a couple weird black lines, and i can’t figure out why!
does anybody know what to do?
here is a a screenshot.

Looks like a normals problem to this black duck.

Have you tried entering edit mode, selecting all verts then hitting Ctrl-N, to “Recalculate Normals Outside”? (Ctrl-Shift-N makes 'em point inwards)

Dude! thanks so much!! it’s like magic!
i didn’t think it was so simple!!

Well, like I always say - Making an atom bomb is easy…once you know how.

Merry Christmas.