code: protected void checkForBatchError(JsonNode root) {
  		JsonNode errorCode = root.get("error");
  		if (errorCode != null) {
  			
  			JsonNode errorDescription = root.get("error_description");
  			if (errorDescription != null) {
  				
  				int code = errorCode.intValue();
  				String msg = errorDescription.asText();
  
  				this.throwCodeAndMessage(code, msg);
  			}
  		}
  	}
docs: The batch call itself seems to have a funky error format:
  
  {"error":190,"error_description":"Invalid OAuth access token signature."}