enable the option nat_ip_allocate_option= "MANUAL_ONLY" get error Incorrect condition type

[ibraheem-sarsour]

TL;DR

i trying to create in gcp nat and and associate it to exist address by the option "MANUAL_ONLY"
i get this error

│ Error: Incorrect condition type
│
│ on .terraform/modules/cloud-nat/main.tf line 29, in locals:
│ 29: nat_ip_allocate_option = var.nat_ip_allocate_option ? var.nat_ip_allocate_option : local.default_nat_ip_allocate_option
│ ├────────────────
│ │ var.nat_ip_allocate_option is "MANUAL_ONLY"
│
│ The condition expression must be of type bool.

Expected behavior

associate the cloud nat to the exist address

Observed behavior

│ Error: Incorrect condition type
│
│ on .terraform/modules/cloud-nat/main.tf line 29, in locals:
│ 29: nat_ip_allocate_option = var.nat_ip_allocate_option ? var.nat_ip_allocate_option : local.default_nat_ip_allocate_option
│ ├────────────────
│ │ var.nat_ip_allocate_option is "MANUAL_ONLY"
│
│ The condition expression must be of type bool.

Terraform Configuration

module "cloud-nat" {
  source     = "terraform-google-modules/cloud-nat/google"
  version    = "~> 1.2"
  project_id = var.project_id
  region     = var.services_region
  router     = "services-router"
  name       = "services-nat" 

  nat_ip_allocate_option= "MANUAL_ONLY"
  nat_ips                = module.address.self_links
  source_subnetwork_ip_ranges_to_nat = "ALL_SUBNETWORKS_ALL_PRIMARY_IP_RANGES"

}

Terraform Version

Terraform v1.1.7
on linux_amd64
+ provider registry.terraform.io/hashicorp/google v3.90.1
+ provider registry.terraform.io/hashicorp/google-beta v4.13.0
+ provider registry.terraform.io/hashicorp/null v3.1.0
+ provider registry.terraform.io/hashicorp/random v3.1.0
+ provider registry.terraform.io/hashicorp/template v2.2.0

Additional information

No response

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