Predict using new external input for narx model

Hi every one ,i want to test my narx network with new exogenous input to forecast the 59 futures values,i applied this code https://www.mathworks.com/help/deeplearning/ref/narxnet.html but its give me error when i use this function ypred=netc(xnew,xic,aic) ,and when i use this function ypred=netc(xnew) its give me the same value of all the columns i don't know what to do,please help me if you don't mide .thanks in advance