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Fatal error: Uncaught RuntimeException: Failed to listen on "tcp://0.0.0.0:8081": Address already in use (EADDRINUSE) in /var/www/html/mun/vendor/react/socket/src/TcpServer.php:184 Stack trace: #0 /var/www/html/mun/vendor/react/socket/src/Server.php(77): React\Socket\TcpServer->__construct() #1 /var/www/html/mun/vendor/cboden/ratchet/src/Ratchet/Server/IoServer.php(59): React\Socket\Server->__construct() #2 /var/www/html/mun/voting_server/mun_voting_server_v3.php(1133): Ratchet\Server\IoServer::factory() #3 {main} thrown in /var/www/html/mun/vendor/react/socket/src/TcpServer.php on line 184