could not add rhel host ,does anyone sucess add a rhel host as a hypervisor

All rhel angent  rpms  have been installed in rhel6.1 x86_64 ,when  adding the host into HOSTS of rhev managerment console .  the status  show "install failed" . check the event : test platform succeeded .  

failed to install host  manager.redhat.com. step:INSTALLER LIB；Details: deployUtil.py download failed. pathname could not be resolved (verify computer/domain name)

could any one add rhel host as hypervisor succeed ?