Problem Installing with Fedora

[blackhat840]

I am trying to install ISPCP on Fedora Core, and after many problems this is what I face after doing the perl ./ispcp-setup


ERROR: External command '/usr/sbin/postmap /etc/postfix/ispcp/aliases /etc/postfix/ispcp/domains /etc/postfix/ispcp/mailboxes /etc/postfix/ispcp/transport /etc/postfix/ispcp/sender-access &> /tmp/ispcp-setup-services.log' returned '127' status !