SMTP TLS Authentication using Postfix in Leopard

Hi. I used Postfix enabler in Tiger to set up a mail server and recently upgraded to Tiger. I've been getting errors that read:

Transcript of session follows.

Out: 220 [domain_name].com ESMTP Postfix
In: EHLO [192.168.x.x]
Out: 250-[domain_name].com
Out: 250-PIPELINING
Out: 250-SIZE
Out: 250-VRFY
Out: 250-ETRN
Out: 250-AUTH LOGIN PLAIN
Out: 250-AUTH=LOGIN PLAIN
Out: 250-STARTTLS
Out: 250-ENHANCEDSTATUSCODES
Out: 250-8BITMIME
Out: 250 DSN
In: STARTTLS
Out: 454 4.3.0 TLS not available due to local problem

Session aborted, reason: lost connection

Mail logs read:

Jan 16 21:32:46 Mini postfix/smtpd[570]: warning: connect to private/tlsmgr: No such file or directory
Jan 16 21:32:47: --- last message repeated 1 time ---
Jan 16 21:32:47 Mini postfix/smtpd[570]: warning: problem talking to server private/tlsmgr: No such file or directory
Jan 16 21:32:47 Mini postfix/smtpd[570]: warning: no entropy for TLS key generation: disabling TLS support
Jan 16 21:32:47 Mini postfix/smtpd[570]: connect from x-x-x-x.dynamic.[isp].net[x.x.x.x]
Jan 16 21:32:47 Mini postfix/smtpd[570]: lost connection after STARTTLS from x-x-x-x.dynamic.[isp].net[x.x.x.x]

This happens when I try to send an email using my SMTP server. I think it's an easy command such as regenerating the TLS key or something along the lines of that. Any help will be appreciated.

Thank you.