Error when using example <complete-vpn-connection-transit-gateway>

[eici]

Terraform v0.12.20 provider.aws v2.47.0

if i do:

• git clone https://github.com/terraform-aws-modules/terraform-aws-vpn-gateway.git
• cd terraform-aws-vpn-gateway/examples/complete-vpn-connection-transit-gateway
• terraform init
• terraform plan

i get the error message down below.

terraform plan
Refreshing Terraform state in-memory prior to plan...
The refreshed state will be used to calculate this plan, but will not be
persisted to local or remote state storage.

Error: Invalid template interpolation value

  on ../../main.tf line 13, in locals:
  13:   connection_identifier = var.connect_to_transit_gateway ? "TGW ${var.transit_gateway_id}" : "VPC ${var.vpc_id}"
    |----------------
    | var.vpc_id is null

The expression result is null. Cannot include a null value in a string
template.```

[dinodam]

I have the same issue as mentioned above.

Terraform v0.12.24

• provider.aws v2.54.0

I just copied your example to a local file and call the module remotely

`#create VPN gatway

module "vpn_gateway_1" { source = "terraform-aws-modules/vpn-gateway/aws" version = "~> 2.0"

transit_gateway_id = aws_ec2_transit_gateway.this.id customer_gateway_id = module.vpc.cgw_ids[0]

tunnel1_inside_cidr = "169.254.44.88/30" tunnel2_inside_cidr = "169.254.44.100/30" tunnel1_preshared_key = "1234567890abcdefghijklmn" tunnel2_preshared_key = "abcdefghijklmn1234567890" }

module "vpn_gateway_2" { source = "terraform-aws-modules/vpn-gateway/aws" version = "~> 2.0"

transit_gateway_id = aws_ec2_transit_gateway.this.id customer_gateway_id = module.vpc.cgw_ids[1]

tunnel1_inside_cidr = "169.254.33.88/30" tunnel2_inside_cidr = "169.254.33.100/30" tunnel1_preshared_key = "1234567890abcdefghijklmn" tunnel2_preshared_key = "abcdefghijklmn1234567890" }

resource "aws_ec2_transit_gateway" "this" { description = "complete-vpn-connection-transit-gateway" }

resource "aws_ec2_transit_gateway_vpc_attachment" "this" { subnet_ids = module.vpc.private_subnets transit_gateway_id = aws_ec2_transit_gateway.this.id vpc_id = module.vpc.vpc_id }`

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