Problem in Training Ann for larger input/Output data.

Hi all, I am new to neural networking.I want train my neural network for pt = [10x7 array],but it is not getting trained.However for pt = [10x4 array] it is being trained properly. Can anybody tell me what is the problem with this code.

pt = [10x7 ] array; % pt = input

t = [4 9 16 25 36 49 64]; % t = target

net = newff(pt,t,10);

net.trainParam.epochs = 500;

net.trainParam.goal = 0.01;

net = train(net,pt,t);

y = sim(net,pt);

Thanks in Advance.