Call to function "element" failed: cannot use element function with an empty list

Terraform
1

I am trying to use count to create multiple (var.VM_count = 2) VMs and their NICs. I am struggling to get the plan to run and assign the NICs to the corresponding VM resources. I keep receiving

Error: Error in function call

on …\Modules\AzureVM\Main.tf line 44, in resource “azurerm_virtual_machine” “vm”:
44: network_interface_ids = [“${element(azurerm_network_interface.NIC.*.id, count.index)}”]
|----------------
| azurerm_network_interface.NIC is empty tuple
| count.index is 1

Call to function “element” failed: cannot use element function with an empty
list.

Here is section of the plan.

resource "azurerm_network_interface" "NIC" {
  count 	      = "${var.VM_count}"
  name                = "${var.VM_Name}${count.index}-nic"
  location            = "${azurerm_resource_group.RG.location}"
  resource_group_name = "${var.RG}"
    ip_configuration {
        name                          = "${var.VM_Name}${count.index}-IP"
        subnet_id                     = "${var.vnet}"
        private_ip_address_allocation = "${var.IP_type}"

  }
     tags = {
        Billing     = "${var.billing_tag}"
        Environment = "${var.OctoEnvName}"
  }
}

resource "azurerm_virtual_machine" "vm" {
  count 	        = "${var.VM_count}"
  name                  = "${var.VM_Name}${count.index}"
  location              = "${azurerm_resource_group.RG.location}"
  resource_group_name   = "${var.RG}"
  network_interface_ids = ["${element(azurerm_network_interface.NIC.*.id, count.index)}"]  
  vm_size               = "${var.vm_size}"
  depends_on = ["azurerm_network_interface.NIC"]
     tags = {
        Billing     = "${var.billing_tag}"
        Environment = "${var.OctoEnvName}"
  }

I am at a loss as to why the NIC isn’t creating and is only showing a count of 1 in the error. Any suggestions would great.

Thanks!

2

Hi @darrinmisk,

There could be something out of order. Did you resolve this yet? It would be useful to see the output for which one gets created first. Based on the syntax, is this for Terraform v0.11?