│ Error: Reference to undeclared resource - amazon-web-services

Question

I am new to terraform and trying to make an instance of AWS (t2.nano) by the image below.
this is my tf file:
provider "aws" {
profile = "default"
region = "us-west-2"
}
resource "aws_s3_bucket" "prod_tf_course" {
bucket = "tf-course-20210607"
acl = "private"
}
resource "aws_default_vpc" "default" {}
resource "aws_security_group" "group_web"{
name = "prod_web"
description = "allow standard http and https ports inbound and everithing outbound"
ingress{
from_port = 80
to_port = 80
protocol = "tcp"
cidr_blocks = ["0.0.0.0/0"]
}
ingress{
from_port = 443
to_port = 443
protocol = "tcp"
cidr_blocks = ["0.0.0.0/0"]
}
egress{
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
}
tags = {
"Terraform" : "true"
}
}
resource "aws_instance" "prod_web"{
ami = "ami-05105e44227712eb6"
instance_type ="t2.nano"
vpc_security_group_ids = [
aws_security_group.prod_web.id
]
tags = {
"Terraform" : "true"
}
}
When I run the command terraform plan, its produces the following error:
$ terraform plan
╷
│ Error: Reference to undeclared resource
│
│ on prod.tf line 50, in resource "aws_instance" "prod_web":
│ 50: aws_security_group.prod_web.id
│
│ A managed resource "aws_security_group" "prod_web" has not been declared in
│ the root module.
╵
if someone can help me fix it , i will be so happy.

Answer 1

It should be:
vpc_security_group_ids = [
aws_security_group.group_web.id
]
as your aws_security_group is called group_web, not prod_web.