terragrunt: Nested terragrunt file not working on Windows

I am trying to use the nested terragrunt file on Windows. The directory structure is:

.terragrunt
env
  dev
    web
      .terragrunt

The root terragrunt file content.

lock = {
  backend = "dynamodb"
  config {
    state_file_id = "${path_relative_to_include()}"
    aws_region = "eu-west-1"
    table_name = "terragrunt_locks"
  }
}

remote_state = {
  backend = "s3"
  config {
    encrypt = "true"
    bucket = "tfstate"
    key = "${path_relative_to_include()}/terraform.tfstate"
    region = "eu-west-1"
  }
}

The content of terragrunt file in dev/web.

include = {
  path = "${find_in_parent_folders()}"
}

Running terragrunt plan in dev/web, I got the following error:

[terragrunt] 2016/12/27 15:56:03 Reading Terragrunt config file at C:\Users\userA\dev\test-aws\envs\dev\web\.terragrunt
[terragrunt] 2016/12/27 15:56:03 Error parsing Terragrunt config file C:\Users\userA\dev\test-aws\envs\dev\web\.terragrunt: At 2:20: illegal char escape

When I replace ${find_in_parent_folders()} with hardcoded path: ../../../.terragrunt, I got error further along.

[terragrunt] 2016/12/27 15:52:07 Reading Terragrunt config file at C:\Users\userA\dev\test-aws\envs\dev\web\.terragrunt
[terragrunt] 2016/12/27 15:52:07 Error parsing Terragrunt config file C:\Users\userA\dev\test-aws\envs\dev\web\.terragrunt: Error parsing Terragrunt config file C:\Users
\userA\dev\test-aws\.terragrunt: At 15:17: illegal char escape

Could this be another Windows issue?