Can't subscribe to bitcoin core topics

[cs-v6]

I was running this code in tinker bitcoind()->on('rawtx',function($message){\Log::info($message);}), after exit from tinker, the following errors are shown:

PHP Fatal error: Uncaught TypeError: Argument 1 passed to Denpa\ZeroMQ\Connection::onSuccess() must be of the type string, array given, called in C:\Webapps\test.btc.com\vendor\denpa\laravel-zeromq\src\Connection.php on line 167 and defined in C:\Webapps\test.btc.com\vendor\denpa\laravel-zeromq\src\Connection.php:185 Stack trace: #0 C:\Webapps\test.btc.com\vendor\denpa\laravel-zeromq\src\Connection.php(16 7): Denpa\ZeroMQ\Connection->onSuccess(Array, Object(Closure), Object(React\ZMQ\SocketWrapper)) #1 C:\Webapps\test.btc.com\vendor\evenement\evenement\src\Evenement\EventEmitterTrait.php(123): Denpa\ZeroMQ\Connection->Denpa\ZeroMQ\{closure}(Array) #2 C:\Webapps\test.btc.com\vendor\react\zmq\src\SocketWrapper.php(94): Evenement\EventEmitter->emit('messages', Array) #3 C:\Webapps\test.btc.com\vendor\react\zmq\src\SocketWrapper.php(76): React\ZMQ\SocketWrapper->handleReadEvent() #4 C:\Webapps\test.btc.com\vendor\react\event-loop\src\StreamSelectLoop.php(245): React\ZMQ\SocketWrapper->handleEvent(Resour in C:\Webapps\test.btc.com\vendor\denpa\laravel-zeromq\src\Connection.php on line 185

Anyone know what's the problem here?