My domain is not verified at 000webhost and whenever I try to RECHECK NAMESERVERS, it says An internal error occurred and our developers are already notified. Please resolve this issue.
this sounds like an issue at the domain level.
Login to your registrar & check the domain settings, where they are pointed. If you cant see a problem, try using the “reset option” if available.
You might need to wait until the TTL is reached, if you made an error previously it might remain active until the TTL expires & the new domain settings are applied.
Is this issue resolved?
If not provide your domain please