Images in neural network training

I have 65 Images in a file, when i am trying to run it on a neural network with the help of 'nprtool', i am getting this error after running this code. Face is a name of the file where the images are stored.

myDir = 'face/'; ext_img= '*.jpg'; X = dir([myDir ext_img]); nfile = max(size(X)) ;

ext_img= '*.jpg';

 T= zeros;
net = feedforwardnet(100);
 net = configure(net,X,T);
y1 = net(X)

A = reshape(linspace(0,1,16),[4 4])'

[net,tr] = train(net,X,T,Xi,Ai,EW)

I am getting this error. please can anyone help me outwith the code. Error using network/configure (line 118) Input data is not a matrix or cell array. Thank You