[25-Aug-2020 17:56:16 UTC] PHP Fatal error:  Uncaught RuntimeException: Failed to listen on "tcp://127.0.0.1:9001": Address already in use in /home/spring17/public_html/xiaomigrate/vendor/react/socket/src/TcpServer.php:164
Stack trace:
#0 /home/spring17/public_html/xiaomigrate/vendor/react/socket/src/Server.php(36): React\Socket\TcpServer->__construct('tcp://127.0.0.1...', Object(React\EventLoop\StreamSelectLoop), Array)
#1 /home/spring17/public_html/xiaomigrate/vendor/ratchet/rfc6455/tests/ab/startServer.php(10): React\Socket\Server->__construct('127.0.0.1:9001', Object(React\EventLoop\StreamSelectLoop))
#2 {main}
  thrown in /home/spring17/public_html/xiaomigrate/vendor/react/socket/src/TcpServer.php on line 164
