Fatal error: Uncaught RuntimeException: Failed to listen on "tcp://0.0.0.0:8080": Address already in use in /var/www/html/websocket/vendor/react/socket/src/TcpServer.php:184 Stack trace: #0 /var/www/html/websocket/vendor/react/socket/src/Server.php(77): React\Socket\TcpServer->__construct('tcp://0.0.0.0:8...', Object(React\EventLoop\StreamSelectLoop), Array) #1 /var/www/html/websocket/websocket-server.php(89): React\Socket\Server->__construct('0.0.0.0:8080', Object(React\EventLoop\StreamSelectLoop)) #2 {main} thrown in /var/www/html/websocket/vendor/react/socket/src/TcpServer.php on line 184