Create "task" always 500 error

1. Access: https://developer.box.com/reference/post-tasks/

2. click "Try this API"

3. Log in and authorize app

4. Fill required form (file.id that actually exists my file and file.type)

Box API always return below error.

{
  "type": "error",
  "status": 500,
  "code": "internal_server_error",
  "help_url": "http://developers.box.com/docs/#errors",
  "message": "Unexpected Error",
  "request_id": "045ea7ce0383faa8c0a9c89dd26ff009c"
}