title: Module directory does not exist or cannot be read in Terraform
body: <p>I am trying to use Modules for dependencies in my Terraform code. But even after mentioning that particular source path in module, it gives an error “ Module directory  does not exist or cannot be read." and “Unable to evaluate directory – The system cannot find the file specified." Can anyone let me know what can be the reason.</p>
  
  <p>I have to manage 3 different environments with 3 different backend state files for each environment. Here each main file calls the respective module file.The main folder consists of backend config, creation of resource group and it calls modules file</p>
  
  <pre><code>      root
          |
          |-- main 
          |    |--prod  
          |    |--dev    
          |    |--staging
          |-- modules
          |    |--prod   
          |    |--dev     
          |    |--staging
  </code></pre>
  
  <p>------------CODE-----------------</p>
  
  <pre><code>    provider "azurerm" {
      version = "=2.2.0"
     features {}
      }
  
      #--- CREATING RESOURCE GROUP PER ENVIRONEMENT
      terraform {
        backend "azurerm" {
          resource_group_name  = ""
          storage_account_name = ""
          container_name       = ""
          key                  = ""
          }
        }
  
  
      variable "location" {
        description           =   "Location for deployment of the Azure 
      resources"
     }
  
       variable "Code" {
         description           =   "Enter a unique two-letter ID to identify 
      customer resources; should match the DynamoDB table."
      }
  
       variable "EnvironmentType" {
         description       = "Enter a valid environment type. Valid values are 
       Prod, Dev, Staging"
        }
  
      variable "AccountType" {
        description   = "Select the type of account you wish to create. This 
         will determine which environments and other resources are created."
         }
  
  
       resource "azurerm_resource_group" "main" {
        name        = "${var.Code}-${var.EnvironmentType}"
        location    = "${var.location}"
       }
  
       module "ResourcesStack" {
          source                      = "./modules"
          AccountType                 = "${var.AccountType}"
          CustomerCode                = "${var.Code}"
          EnvironmentType             = "${var.EnvironmentType}"
          location                    = "${var.location}"
        }
  </code></pre>