Problem with feedforwardnet toolbox for regression

I have a problem with MATLAB neural network toolbox for reggression! Please help if you know the solution to this issue!

Simply, when I feed 5 inputs and 2 targets, the connection between layers are removed and the training is not being carried out.

Please check the attachment .png picture. The code is as follows:

>> x = [1;2;3;4;5]; %input data
>> t = [6;7]; %target data
>> net = feedforwardnet(10,'traingd'); %network for regression
>> [net,tr] = train(net,x,t); %train