RHEV: Error "Failed to install Host . Step: SetNetworking; Details: addNetwork errored trying to add rhevm bridg

Issue

• The error message is under in the "Events" tab. It occurred after selcting "New" from the host tab, filling out the required information and selectnig "Save".  All I have done is try to add a new host (the first host).

• Below error message is displayed while trying to add/install a Host using RHEV-M GUI.

  Failed to install Host hostname. Step: SetNetworking; Details: addNetwork errored trying to add rhevm bridge.