plesk 8.4.0 to 9.0.1

[persiasoft]

Hi,
i faced this error while upgrading :


Trying to check psa database... Trying to find psa database... version is 0830
DATABASE ERROR!!!
Previous product version is 8.4.0, but previous database
version is 0830. In most of cases it is result of
previous upgrade try failure. Please, restore previous version
from backup, and try again or contact technical support.

ERROR while trying to check database version
Check the error reason(see log file: /tmp/psa_9.0.1_cos4.build90090127.18_upgrade.090208.23.46.log), fix and try again

Aborting...

error: %post(psa-9.0.1-cos4.build90090127.18.i586) scriptlet failed, exit status 1
Stopping Courier-IMAP server:
Stopping imap [ OK ]
Stopping imap-ssl [ OK ]
Stopping pop3 [ OK ]
Stopping pop3-ssl [ OK ]

Starting Courier-IMAP server:
Starting imapd [ OK ]
Starting imap-ssl [ OK ]
Starting pop3 [ OK ]
Starting pop3-ssl [ OK ]

ERROR: An error occurred during installation of packages.
Attention! Your software might be inoperable.
Please, contact product technical support.



=================================

how to fix this ? now control panel is inaccessible

all pages showing this :


Top
Plesk diagnostics
Help