Hi,

Can yo please tell me what all have you tried?

It is also possible that those page were earlier present on your website but they are not present now or you may have changed the URLs. First check the URLs of all those pages which are giving 404 page not found.

If you find any of the above issues, then set 301 redirect on them to the correct URLs.

It may also indicate that your hosting provider had some problems when google was crawling your site. So if the reported 404 URLs are correct then check with your hosting provider if there was any performance issues recently.