jedis报错了，麻烦看看为什么错了啊

Question

clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the poolpublic static void demo1() {    Jedis jedis = null;    JedisPoolConfig config = new JedisPoolConfig();    config.setMaxTotal(30);    config.setMaxIdle(10);    JedisPool pool = new JedisPool(config, "192.168.211.128", 6379);    jedis = pool.getResource();    jedis.set("1", "po");    String s = jedis.get("1");    System.out.println(s);    jedis.close();}public static void main(String[] args) {    demo1();}