Can't upgrade from VHCS2 due to failed database schema update

[Cojones]

Hello,

I was trying to upgrade from VHCS2 to ispCP 1.0.5 but got following error:
ispCP main configuration file
Loading old ispCP configuration file Please enter path to your ispcp.old.conf [/etc/ispcp/ispcp.old.conf]: /etc/vhcs2/vhcs2.conf
Done
Update ispCP configuration file: Done
Check ispCP configuration file: Done

ispCP database
Update ispCP database schema Failed

FATAL: An error was occured during update process!
Correct it and re-run this program.

You can find help at http://isp-control.net/forum

I tried to look for it already but I couldn't find a log or anything like that would tell me more than just "Failed". Does anyone know how to figure out what exactly went wrong?

Thanks!