need help to understand an error ...

Hi, I have opened all my previously made neural networks in the work space. I passed artificial neural networks as arguments to my main function, it reported an error of "undefined function or variable net1". Then i tried to see the performance of the networks in the program somewhere out of the sub function which utilizes them. At the beginning of the program to examine the network's performance i asked one of the networks to estimate an input vector. But this time the error says "reference to a cleared "net1"! Is it possible that the network's contents get cleaned when they come through the function?!! And it becomes empty?

Thanks

[Greg Heath]

Hard to comment without seeing code and relevant error messages.