Need help figuring out what i did wrong? Calc

I got Minus 3 on this problem and im not sure what i did wrong any help would be wonderful. i know its something simple i just cant seem to figure it out.

http://www.flickr.com/photos/54816444@N02/6209730854/

T'(t), N(t), and N(1) are vectors in IR². You've somehow thrown out the i and j and added the scalar components together.

N(t) is a vector in 2D, not the number 0.