Predis\Connection\ConnectionException: Connection refused [tcp://127.0.0.1:6379]
    #0 /home/v3/dlut.com/vendor/predis/predis/src/Connection/StreamConnection.php(128): Predis\Connection\AbstractConnection->onConnectionError('Connection refu...', 111)
    #1 /home/v3/dlut.com/vendor/predis/predis/src/Connection/StreamConnection.php(178): Predis\Connection\StreamConnection->createStreamSocket(Object(Predis\Connection\Parameters), 'tcp://127.0.0.1...', 4)
    #2 /home/v3/dlut.com/vendor/predis/predis/src/Connection/StreamConnection.php(100): Predis\Connection\StreamConnection->tcpStreamInitializer(Object(Predis\Connection\Parameters))
    #3 /home/v3/dlut.com/vendor/predis/predis/src/Connection/AbstractConnection.php(81): Predis\Connection\StreamConnection->createResource()
    #4 /home/v3/dlut.com/vendor/predis/predis/src/Connection/StreamConnection.php(258): Predis\Connection\AbstractConnection->connect()
    #5 /home/v3/dlut.com/vendor/predis/predis/src/Connection/AbstractConnection.php(180): Predis\Connection\StreamConnection->connect()
    #6 /home/v3/dlut.com/vendor/predis/predis/src/Connection/StreamConnection.php(288): Predis\Connection\AbstractConnection->getResource()
    #7 /home/v3/dlut.com/vendor/predis/predis/src/Connection/StreamConnection.php(394): Predis\Connection\StreamConnection->write('*2\r\n$6\r\nEXISTS\r...')
    #8 /home/v3/dlut.com/vendor/predis/predis/src/Connection/AbstractConnection.php(110): Predis\Connection\StreamConnection->writeRequest(Object(Predis\Command\KeyExists))
    #9 /home/v3/dlut.com/vendor/predis/predis/src/Client.php(331): Predis\Connection\AbstractConnection->executeCommand(Object(Predis\Command\KeyExists))
    #10 /home/v3/dlut.com/vendor/predis/predis/src/Client.php(314): Predis\Client->executeCommand(Object(Predis\Command\KeyExists))
    #11 /home/v3/dlut.com/app/libs/Redis.php(67): Predis\Client->__call('exists', Array)
    #12 /home/v3/dlut.com/app/libs/Session.php(37): app\libs\Redis::exists('sid.A1KW002kYoA...')
    #13 /home/v3/dlut.com/app/libs/Session.php(119): app\libs\Session::getId()
    #14 /home/v3/dlut.com/app/service/controller/Code.php(24): app\libs\Session::set('validCode', 'MNTB')
    #15 [internal function]: app\service\controller\Code->indexAction()
    #16 /home/v3/dlut.com/vendor/wj008/beacon/core/Route.php(635): ReflectionMethod->invokeArgs(Object(app\service\controller\Code), Array)
    #17 /home/v3/dlut.com/vendor/wj008/beacon/core/Route.php(748): beacon\Route::runMethod('app\\service\\con...', Object(ReflectionMethod))
    #18 /home/v3/dlut.com/www/index.php(82): beacon\Route::run()
    #19 {main}