Resource limit RLIMIT_NPROC cannot be set. This may be because the BSD::Resource module is not available on your system, or it may be because your operating system does not support RLIMIT_NPROC. Without resource limits, the FTP server may be open to denial of service (DoS) attacks. The real error was:  at /Perl_Modules/new/lib/site_perl/Net/FTPServer.pm line 3270.
no ftp user in password file...... at /Perl_Modules/new/lib/site_perl/Net/FTPServer/Full/Server.pm line 285, <STDIN> line 2.
	Net::FTPServer::__ANON__('no ftp user in password file...... at /Perl_Modules/new/lib/site_perl/Net/FTPServer/Full/Server.pm line 285
	Net::FTPServer::Full::Server::user_login_hook('Net::FTPServer::Full::Server=HASH(0x2f914)', 'anonymous', 1) called at /Perl_Modules/new/lib/site_perl/Net/FTPServer.pm line 4662
	Net::FTPServer::_PASS_command('Net::FTPServer::Full::Server=HASH(0x2f914)', 'PASS', 'xxx.aa.com') called at /Perl_Modules/new/lib/site_perl/Net/FTPServer.pm line 3002
	Net::FTPServer::run('Net::FTPServer::Full::Server') called at ftpd.pl line 35