PHP 7.1.5?

sudo??php demo-telnet.php start 錯誤如下：

PHP Fatal error: ?Redefinition of parameter $_null in /data/www/MeepoPS/MeepoPS/Core/Event/Libevent.php on line 155

[INFO][2017-06-14 16:29:38][8889]MeepoPS check shutdown reason

[ERROR][2017-06-14 16:29:38][8889]stream_socket_serverMeepoPS unexpectedly quits. last error: {"type":64,"message":"Redefinition of parameter $_null","file":"\/data\/www\/MeepoPS\/MeepoPS\/Core\/Event\/Libevent.php","line":155}

[ERROR][2017-06-14 16:29:38][8888]MeepoPS instance(MeepoPS-Telnet:8889) exit. Status: 65280

PHP Fatal error: ?Redefinition of parameter $_null in /data/www/MeepoPS/MeepoPS/Core/Event/Libevent.php on line 155