Route table association errors: element() may not be used with an empty list

[woodland-appcolony]

Getting this error when attempting to use this module:

Error: Error running plan: 2 error(s) occurred:

* module.vpc.aws_route_table_association.database: 3 error(s) occurred:

* module.vpc.aws_route_table_association.database[1]: element: element() may not be used with an empty list in:

${element(aws_route_table.private.*.id, count.index)}
* module.vpc.aws_route_table_association.database[2]: element: element() may not be used with an empty list in:

${element(aws_route_table.private.*.id, count.index)}
* module.vpc.aws_route_table_association.database[0]: element: element() may not be used with an empty list in:

${element(aws_route_table.private.*.id, count.index)}
* module.vpc.aws_route_table_association.elasticache: 3 error(s) occurred:

* module.vpc.aws_route_table_association.elasticache[2]: element: element() may not be used with an empty list in:

${element(aws_route_table.private.*.id, count.index)}
* module.vpc.aws_route_table_association.elasticache[1]: element: element() may not be used with an empty list in:

${element(aws_route_table.private.*.id, count.index)}
* module.vpc.aws_route_table_association.elasticache[0]: element: element() may not be used with an empty list in:

${element(aws_route_table.private.*.id, count.index)}

Here is the tf file

module "vpc" {
  source = "terraform-aws-modules/vpc/aws"

  name = "prod-vpc"

  cidr = "10.0.0.0/16"

  azs                 = ["us-west-2a", "us-west-2b", "us-west-2c"]
  public_subnets      = ["10.0.0.0/22", "10.0.4.0/22", "10.0.8.0/22"]
  database_subnets    = ["10.0.128.0/24", "10.0.129.0/24", "10.0.130.0/24"]
  elasticache_subnets = ["10.0.131.0/24", "10.0.132.0/24", "10.0.133.0/24"]

  enable_dns_support   = true
  enable_dns_hostnames = true
  enable_nat_gateway   = false

  tags = "${local.common_tags}"
}

Module version 1.10.0

Terraform versions

Terraform v0.11.1
+ provider.aws v1.5.0

[antonbabenko]

Another unusual use case - no private subnets. I will make a PR in a few minutes (hopefully it will work for other people as well).

[antonbabenko]

v1.11.0 has been released. Give it a try.

[woodland-appcolony]

@antonbabenko That did the trick; thank you for such a speedy fix!

[github-actions]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues. If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.