USING A NEURAL NETWORK AS AN OBJECTIVE FUNCTION INSIDE A GENETIC ALGORITHM

I trained a neural network with the name 'net', after that I am using a genetic algorithm to do some optimization. After using this syntax, the following 'error' message appears.

C = ga(@net,4,[],[],[],[],[30 80 170 230],[50 100 310 250])

Error: "net" was previously used as a variable, conflicting with its use here as the name of a function or command.