Data Remote State Unsupported attribute

Terraform
1

Hello everybody,
I am using Terraform ver 0.12.24 and running into an issue when trying to use data.terraform_remote_state.project.outputs.project_id. This object does not have an attribute named project_id.
This is happening on a terraform plan
My main.tf looks like this

# ------------------------------------------------------------
#   BACKEND BLOCK
# ------------------------------------------------------------

terraform {
  backend "gcs" {}
}

# ------------------------------------------------------------
#   PROVIDER BLOCK
# ------------------------------------------------------------

provider "google-beta" {
  credentials = var.credentials_path
  region      = "us-central1"
  version     = "~> 2.0"
}

provider "google" {
  credentials = var.credentials_path
  region      = "us-central1"
  version     = "~> 2.0"
}

# ------------------------------------------------------------
#   TERRAFORM REMOTE STATE

  data "terraform_remote_state" "project" {
  backend = "gcs"
  config = {
    bucket      = var.bucket
    prefix      = var.prefix
    credentials = var.credentials_path
  }
}


# ------------------------------------------------------------
#   MAIN BLOCK
# ------------------------------------------------------------

module "simple_vpc" {
  source  = "terraform-google-modules/network/google"
  version = "~>2.3"


 

  project_id   = "${data.terraform_remote_state.project.outputs.project_id}"
  network_name = var.network_name
  routing_mode = var.routing_mode
  subnets = [
    {
      subnet_name           = var.subnet_name
      subnet_ip             = var.subnet_ip
      subnet_region         = var.subnet_region
      subnet_private_access = var.subnet_private_access
      subnet_flow_logs      = var.subnet_flow_logs
      description           = var.description
    },
  ]
}

outputs.tf

output network_name {
  value = module.simple_vpc.network_name
}

output subnets_names {
  value = module.simple_vpc.subnets_names
}

output subnets_self_links {
  value = module.simple_vpc.subnets_self_links
}

output subnets_ips {
  value = module.simple_vpc.subnets_ips
}


output "project_id" {
  value       = module.simple_vpc.project_id
  description = "VPC project id"
}

variables.tf

variable credentials_path {
  description = "./credentials.json"
}

variable bucket {
  description = "GCS bucket name that stores state"
}

variable prefix {
  description = "GCS folder name"
}


variable project_id {
  description = "Project this vpc should be attached to."
}

variable network_name {
  description = "Name of the VPC."
}

variable routing_mode {
  description = "Routing mode. GLOBAL or REGIONAL"
  default     = "GLOBAL"
}

variable subnet_name {
  description = "Name of the subnet."
}

variable subnet_ip {
  description = "Subnet IP CIDR."
}

variable subnet_region {
  description = "Region subnet lives in."
}

variable subnet_private_access {
  default = "true"
}

variable subnet_flow_logs {
  default = "true"
}

variable description {
  default = "Deployed through Terraform."
}