OS: Fedora 7

When I was uprading to to ZCS-5 from 4.5 I accidently killed the upgrade script. After retrying I get this error:

Code:
Stopping zimbra services
Verifying /opt/zimbra/conf/my.cnf
Starting mysql
Starting logger mysql
Sun Jan 13 17:15:39 2008: SELECT value FROM config WHERE name = 'db.version'
This appears to be 4.5.6_GA
Redolog Version: 1.21 New Redolog Version: 1.21
Schema upgrade required
Running /opt/zimbra/libexec/scripts/migrate20070726-ImapDataSource.pl
Sun Jan 13 17:15:50 2008: Verified schema version 45.
ERROR 1050 (42S01) at line 1: Table 'imap_folder' already exists
Sun Jan 13 17:15:53 2008: Error while running '/opt/zimbra/bin/mysql --user=zimbra --password=y06NsdfdfUDhvUsdffHM8L90gRX8 --database=zimbra --batch --skip-column-names'.
Script failed with code 256:  - exiting
UPGRADE FAILED - exiting
I really don't know what to do. Thanks.