code: func GetMessage(err interface{}) string {
  	switch e := err.(type) {
  	case DropboxError:
  		return extractFullErrorMessage(e, false)
  	case runtime.Error:
  		return runtime.Error(e).Error()
  	case error:
  		return e.Error()
  	default:
  		return "Passed a non-error to GetMessage"
  	}
  }
docs: // This returns the error string without stack trace information.