If you have getting this error "No free IP found in Hostname: X.X.X.X, Datacenter: XX****", follow the given below steps to solve this issue.
1) Login as your WHMCS admin panel then go to "Addons" >> "WGS VMware" addon module >> "IP Mapping".
2) Make sure you have added the IP with selected datacenter/hostname or also there are free IP's with selected datacenter/hostname.
3) Go to WGS VMware addon module >> Provisioning Settings. Choose specific vCenter and click on Sync Settings.
4) Click on specific Datacenter and then hostname and after that enter No. of VM Limits and Save the changes.
After checking these possible settings try to create VM again.
