I have a this message error

Warning: Performance function replaced with squared error performance.

> In trainlm>formatNet (line 153)

In trainlm (line 61)

In nntraining.setup (line 48)

In network/train (line 335)

In neurona2capasok (line 31)

Answer 1

[KSSV]

It is not an error. It is a warning. You have used some performance metric but that is not compatible/ supported with your present mode of run, so it is switched to squarred error performance.