x13 tells me series has no estationality, but...

[jfca283]

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

[EViews Gareth]

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

[jfca283]

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