If my cluster has a vm group named “test”, my code is
resource “vsphere_compute_cluster_vm_group” “cluster_vm_group” {
name = “test”
compute_cluster_id = data.vsphere_compute_cluster.cluster.id
virtual_machine_ids = vsphere_virtual_machine.vm .*.id
}
I got the error 
Error: A specified parameter was not correct: groupSpec.info.name
on .terraform/modules/example-server-windowsvm/main.tf line 291, in resource “vsphere_compute_cluster_vm_group” “cluster_vm_group”:
291: resource “vsphere_compute_cluster_vm_group” “cluster_vm_group” {
If input the name not exist , it will run successful