when I restart redis cause
java.util.concurrent.ExecutionException: io.lettuce.core.RedisCommandExecutionException: NOAUTH Authentication required. Why is this a problem use version like this

@Configuration
public class RedisConfig {

    @Autowired
    private RedisProperties redisProperties;

    @Bean(destroyMethod = "close")
    public StatefulRedisConnection StatefulRedisConnection() {
        RedisURI redisUri = RedisURI.builder().withPassword(redisProperties.getPassword())
                .withSentinel(redisProperties.getSentinel().getNodes().get(0).split(":")[0],
                        Integer.valueOf(redisProperties.getSentinel().getNodes().get(0).split(":")[1]))
                .withSentinelMasterId(redisProperties.getSentinel().getMaster())
                .withDatabase(redisProperties.getDatabase()).build();
        RedisClient redisClient = RedisClient.create(redisUri);
        return redisClient.connect(new SerializedObjectCodec());
    }
}

public class CacheImpl implements Cache {
    @Autowired
    private StatefulRedisConnection connect;

    public Boolean addCourseInfosCache() {
        RedisAsyncCommands commands = connect.async();
        // disable auto-flushing
        commands.setAutoFlushCommands(false);
        List> futures = Lists.newArrayList();
        commands.flushCommands();
    }
}