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i'm quite sure it has.
This is the error i get:

WARNING: Series should not be a candidate for seasonal adjustment
because the spectrum of the original series (Table A1 or B1)
has no visually significant seasonal peaks.

Why am i sure? because i'm working with labour force and employed people.
Everywhere it's adjusted by its seasonality.
Can you guide me what should i do?
Thanks

Are you sure the data hasn't already been seasonally adjusted?

Very sure. The strange issue is x13 gives me the seasonally adjusted series, irregular and trend series.
But the message posted made me suspicious.