Error: Unsupported attribute

╷
│ Error: Unsupported attribute
│
│   on main.tf line 15, in resource "aws_db_instance" "my_mariadb_instance":
│   15:   db_subnet_group_name =  module.vpc.my-vpc-name.database_subnet_group
│     ├────────────────
│     │ module.vpc is a object, known only after apply
│
│ This object does not have an attribute named "my-vpc-name".
╵

╷
│ Error: Unsupported attribute
│
│   on main.tf line 16, in resource "aws_db_instance" "my_mariadb_instance":
│   16:   db_subnet_group_name =  "${module.vpc.aws_db_subnet_group}"
│     ├────────────────
│     │ module.vpc is a object, known only after apply
│
│ This object does not have an attribute named "aws_db_subnet_group".
╵

╷
│ Error: Unsupported attribute
│
│   on main.tf line 15, in resource "aws_db_instance" "my_mariadb_instance":
│   15:   db_subnet_group_name =  module.vpc.database_subnet_group.this
│     ├────────────────
│     │ module.vpc.database_subnet_group is ""
│
│ Can't access attributes on a primitive-typed value (string).
╵

╷
│ Error: Unsupported attribute
│
│   on outputs.tf line 2, in output "xxxxxx":
│    2:   value = module.xxxxxx.rds_address
│     ├────────────────
│     │ module.xxxxxxxx is a list of object
│
│ Can't access attributes on a list of objects. Did you mean to access
│ attribute "rds_address" for a specific element of the list, or across all
│ elements of the list?
╵

Related

• Terragrunt: ERRO[0000] Error: Unsupported attribute
• terragrunt terragrunt-info
• Terraform modules
• locals.tf

See also

• terraform plan: [ -refresh-only | -lock=false | -target | -var-file | will be created | --help], Terraform plan errors, Terraform plan examples, Terraform plan execution errors, (known after apply)