nested exception error while importing image from vcenter inventory

HI,

I am trying to import win 7 master template in order to provision VDI on vmware esx hosts.

vCenter is added with datacenter however at the time of expanding esx host to select the template it shows with error.

; nested exception is:

java.net.unknownHostException:win-test1 (=1)

Please suggest whats missing or incorrect.

i am using vworkspace 7.6

Thanks,

Gurpreet