terraform import error with module with rds instances - amazon-web-services

Question

So I created rds instance and I am trying to import it into terraform. However I am using modules in my code so when running terraform I am getting the error:
AT first it says:
module.rds_dr.aws_db_instance.db_instance: Import prepared!
Prepared aws_db_instance for import
then it gives error:
Error: Cannot import non-existent remote object
While attempting to import an existing object to aws_db_instance.db_instance,
the provider detected that no object exists with the given id. Only
pre-existing objects can be imported; check that the id is correct and that it
is associated with the provider's configured region or endpoint, or use
"terraform apply" to create a new remote object for this resource.
The command I ran was :
terraform import module.rds_dr.aws_db_instance.db_instance db-ID
I created the instance using source of module in github. The code for the rds instance is below:
# PostgreSQL RDS DR Instance
module "rds_dr" {
source = "git#github.com:****"
name = var.rds_name_dr
engine = var.rds_engine_dr
engine_version = var.rds_engine_version_dr
family = var.rds_family_dr
instance_class = var.rds_instance_class_dr
# WARNING: 'terraform taint random_string.rds_password' must be run prior to recreating the DB if it is destroyed
password = random_string.rds_password.result
port = var.rds_port_dr
security_groups = [aws_security_group.rds_app.id]
subnets = [module.vpc.public_subnets]
auto_minor_version_upgrade = var.rds_auto_minor_version_upgrade_dr
backup_retention_period = var.rds_backup_retention_period_dr
backup_window = var.rds_backup_window_dr
maintenance_window = var.rds_maintenance_window_dr
environment = var.environment
kms_key_id = aws_kms_key.rds.arn
multi_az = var.rds_multi_az_dr
notification_topic = var.rds_notification_topic_dr
publicly_accessible = var.rds_publicly_accessible_dr
storage_encrypted = var.rds_storage_encrypted_dr
storage_size = var.rds_storage_size_dr
storage_type = var.rds_storage_type_dr
apply_immediately = true
}
Also, this is part of the module code:
resource "aws_db_instance" "db_instance" {
allocated_storage = local.storage_size
allow_major_version_upgrade = false
apply_immediately = var.apply_immediately
auto_minor_version_upgrade = var.auto_minor_version_upgrade
backup_retention_period = var.read_replica ? 0 : var.backup_retention_period
backup_window = var.backup_window
character_set_name = local.is_oracle ? var.character_set_name : null
copy_tags_to_snapshot = var.copy_tags_to_snapshot
db_subnet_group_name = local.same_region_replica ? null : local.subnet_group
deletion_protection = var.enable_deletion_protection
engine = var.engine
engine_version = local.engine_version
final_snapshot_identifier = lower("${var.name}-final-snapshot${var.final_snapshot_suffix == "" ? "" : "-"}${var.final_snapshot_suffix}")
iam_database_authentication_enabled = var.iam_authentication_enabled
identifier_prefix = "${lower(var.name)}-"
instance_class = var.instance_class
iops = var.storage_iops
kms_key_id = var.kms_key_id
license_model = var.license_model == "" ? local.license_model : var.license_model
maintenance_window = var.maintenance_window
max_allocated_storage = var.max_storage_size
monitoring_interval = var.monitoring_interval
monitoring_role_arn = var.monitoring_interval > 0 ? local.monitoring_role_arn : null
multi_az = var.read_replica ? false : var.multi_az
name = var.dbname
option_group_name = local.same_region_replica ? null : local.option_group
parameter_group_name = local.same_region_replica ? null : local.parameter_group
password = var.password
port = local.port
publicly_accessible = var.publicly_accessible
replicate_source_db = var.source_db
skip_final_snapshot = var.read_replica || var.skip_final_snapshot
snapshot_identifier = var.db_snapshot_id
storage_encrypted = var.storage_encrypted
storage_type = var.storage_type
tags = merge(var.tags, local.tags)
timezone = local.is_mssql ? var.timezone : null
username = var.username
vpc_security_group_ids = var.security_groups
}
This is my code for the providers:
# pinned provider versions
provider "random" {
version = "~> 2.3.0"
}
provider "template" {
version = "~> 2.1.2"
}
provider "archive" {
version = "~> 1.1"
}
# default provider
provider "aws" {
version = "~> 2.44"
allowed_account_ids = [var.aws_account_id]
region = "us-east-1"
}
# remote state
terraform {
required_version = "0.12.24"
backend "s3" {
key = "terraform.dev.tfstate"
encrypt = "true"
bucket = "dev-tfstate"
region = "us-east-1"
}
}
I have inserted the correct DB ID and i still do not know why terraform says "import non-existent remote object"?
How do I fix this?