according to googlr server returns a status of 200

According to Google

We've detected that your server returns a status of 200 (found successfully) for pages that don't exist. We can't verify sites with this configuration because it would enable anyone to verify ownership of your site. You can try our meta tag verification method or change your server's configuration

Is this related to sef advance or to my server configuration ?

Thnaks,
Alon

If you define a 404 page in SEF Advance configuration, you will get 404 error for pages that don't exist.