Webmail link give me a nice error 500

[Skud]

Hi dudes, thanjs for the best job of this usefully cp.

3 Years experience on ubuntu server and 1 problem that make me crazy.

Contest:

Ubuntu 12.10
ISPCP 1.0.7
Virtual Machine for test
address in my Lan: 192.168.100.112
Errors in logs: 0

The problem:
Easy, when i click on the Webmail link, i receive an 500 error in the browser.

I apply this controls:
Permissions on the tools/webmail
Correct location of the php
Try to change the /tools/Webmail to /tools/webmail/src/ ...
but i have ever the same problems.
The other links (filemanager and phpmyadmin works ok).

Any Ideas?

Thankz!