proftpd is burning me after upgrade

["alberto_rodriguez_lists@altavista.com" <alberto_rodriguez_lists@altavista.com>]

Hi there,

   I am getting a message just starting proftpd daemon after upgrade the 
package.
It's "No certificate files found!".
I think it's a proftpd new feature problem or any so.
Do u have any idea for create or disable this burning message?

- Daemon is working perfectly.

Seeya and thanks.