Im beginning to HATE this stuff...DNS problem..can someone help?

I am getting these emails about my new server and cant figure out exactly what I need to do to fix it:

IMPORTANT: Do not ignore this email.
The hostname (challenger) resolves to . It should resolve to 209.xxx.xxx.xxx. Please be sure to correct /etc/hosts as well as the 'A' entry in zone file for the domain.

Some are all of these problems can be caused by
/etc/resolv.conf being setup incorrectly. Please check this file if you
believe everything else is correct.

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can anyone help me here?

 

 

 

 

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