(ERROR: You don't have a valid hostname set!)

Hello, I've looked every where and i've failed to get the right solution to this challenger. Am getting an error of

Your Hostname is: uds.domain.com and it resolves to IP: (ERROR: You don't have a valid hostname set!)
rDNS/PTR = FAILED, check with your hosting provider! FAILED



Yet where I lookup for its PTR is bring the hostname..

Please help me with the solution