How plotfit in neural network works?

When I run this

figure, plotfit(net,inputs,targets)

I get these errors

Error in mapminmax>apply (line 275)
  y = (x - xmin(:,copyQ)) .* gain(:,copyQ) + settings.ymin;

Error in nnproc.pre_inputs (line 15)
      xi = pfcns(k).apply(xi,pfcns(k).settings);

Error in nnsim.y (line 29)
Pc = nnproc.pre_inputs(fcns,Xc);

Error in plotfit>update_plot (line 384)
    y = nnsim.y(net,x);

Error in plotfit (line 109)
      plotData = update_plot(param,fig,plotData,update_args{:});

Thanks!