open error: Invalid argument at C:/Perl/site/lib/MCE/Shared/Server.pm line 1035 thread 1, <__ANONIO__> line 6.
        MCE::Shared::Server::__ANON__() called at C:/Perl/site/lib/MCE/Shared/Server.pm line 1324 thread 1
        MCE::Shared::Server::_loop(0, 3232) called at C:/Perl/site/lib/MCE/Shared/Server.pm line 335 thread 1
        eval {...} called at C:/Perl/site/lib/MCE/Shared/Server.pm line 335 thread 1