connect onFailure() (0)

[wall3001]

mqtt connect error, the IMqttActionListener callback onFailure shows that "connect onFailure() (0)" It has been called by per 5ms.Then I try to reconnect per 30s ,it still failed.

[wall3001]

in MqttDefaultFilePersistence.java invoke this method then causes this MqttPersistenceException. private void restoreBackups(File dir) throws MqttPersistenceException { File[] files = dir.listFiles(new PersistanceFileFilter(MESSAGE_BACKUP_FILE_EXTENSION));

	if (files == null) {
		throw new MqttPersistenceException();
	}

[BigKarel]

有解决办法吗？