This is not a hard fix at all. Just follow these easy steps and your website will be back up in no-time.

1. Go to your WHM Control Panel
2. On the left side, find Service Configuration.
3. Click Service Manager.
4. Find the checkboxes (there should be two) for named or BIND.
5. Select the checkboxes, and then scroll to the bottom of the page and hit save.
6. Scroll to the bottom of the left hand menu and find the Restart Services header.
7. Select DNS Server (BIND) and then hit YES to restart BIND.
8. You are done!