Fatal error: Uncaught RuntimeException: Failed to listen on "tcp://0.0.0.0:9001": 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/ratchet/rfc6455/tests/ab/startServer.php(15): React\Socket\Server->__construct()
#2 {main}
thrown in /var/www/html/mun/vendor/react/socket/src/TcpServer.php on line 184