I don't know why i received that form google ?

I use OVH

If you have any response, it ll be good

"Googlebot did not crawl your URL because we couldn’t communicate with the DNS server, or because your server had no entry for your site. This could be because the server is down, or because there’s an issue with the DNS routing to your domain. Please check back later. If this problem persists, check with your DNS provider (often, but not always, your web hoster).