Zimbra stopped installation

[agrobio]

Hi, I need help.

We have a 2nd zimbra server as a contingency, it will start if the productive mailserver fail.

I´m trying to install the zimbra 7.1 upgrade but in the middle of steps the scripts stop it with this error:

(I resume the lines before these ones)
Upgrading from 6.0.5_GA_2213 to 7.1.0_GA_3140
Stopping zimbra services...done.
Verifying /opt/zimbra/conf/my.cnf
Starting mysql...done.
This appears to be 6.0.5_GA
Checking ldap status...not running.
Running zmldapapplyldif...done.
Checking ldap status...already running.
Running mysql_upgrade...done.
Schema upgrade required from version 64 to 65.
Running /opt/zimbra/libexec/scripts/migrate20100926-Dumpster.pl
Wed Jun 1 11:17:55 2011: Verified schema version 64.
ERROR 1146 (42S02) at line 77: Table 'mboxgroup1.appointment_dumpster' doesn't exist
Wed Jun 1 11:17:56 2011: Error while running '/opt/zimbra/bin/mysql --user=zimbra --password="my_password" --database=zimbra --batch --skip-column-names'.
Script failed with code 256: - exiting
UPGRADE FAILED - exiting.

Any ideas to continue?

Thank you in advance.