If you get this error either from a Remote Admin Repair window or from a failed status on a deployment you need to verify that the DNS Client service is running on the PDQ Deploy console computer.
If your DNS Client service is stopped, start it. If the Startup type is Manual or Disabled you will need to change it to start Automatically. This is, once again, required for PDQ Deploy console systems and not, necessarily, on the target computers.
You can start the DNS Client service by running the following command from cmd.exe shell.
sc start dnscache