Dns issue when setting nameservers

Hello, I’m setting up my domain, and when I enter the secondary dns server “ns02.000webhost.com”, my provider tells me that the entered server has no valid host name…

Can anyone help me?

@salasrodrigo Plz check this link:
https://status.000webhost.com

No nameservers are down.

Ask your domain registrar to set your nameservers to ns01.000webhost and ns02.000webhost.com