创建数据库实例时出错：InvalidParameterValue：PostgreSQL数据库的数据库引擎无效

我正在尝试使用 Terraform 创建一个 PostgreSQL RDS 实例。这是我的配置的外观：

resource "aws_db_subnet_group" "postgres" {
   name = "postgres-subnets"
   subnet_ids = ["mysub1","mysub2"]
}    
resource "aws_db_instance" "myrds" {
   engine = "postgresql"
   engine_version = "12.4"
   instance_class = "db.t2.micro"
   identifier = "myrds"
   username = "myuser"
   password = "*******"
   allocated_storage = 10
   storage_type = "gp2"
   db_subnet_group_name = "${aws_db_subnet_group.postgres.id}"
}

它失败并出现以下错误：

Error: Error creating DB Instance: InvalidParameterValue: Invalid DB engine

回答