ProFTPd login error

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http://serverfault.com – I've installed CentOS 6 with Apache, MySQL, PHP, NGinx and ProFTPd on it. I can't understand why it doesn't allow to login as root. If I create another user, I can log in easily, but when I try to log in as root it returns an error. Here is my proftpd.conf http://pastebin.com/HbzJA4X6 Thank you in advance for your help! (HowTos)