train neural network with useParallel=no doesn't work

Hello, I want to train several neural networks within a parfor loop. I tried with 'useParallel'='yes', but I get this warning:

Cannot perform computations on a parallel pool.
There is not an open parallel pool.

So I executed train command with 'useParallel'='no', option, but I still get the warning.

Why I'm getting this warning and how to avoid it?

Answer 1

[KSSV]

set _usePArallel' to 'yes'.

[kira]

we can't use Parallel inside a parfor loop. If fact, i received the warning when I tried, so I change to useParallel=no, but I still get the same warning, and that's why I'm asking. (I will add this to the question)