Code:
2007-01-27 20:51:21,230 INFO [main] [] DbPool - Setting mysql connector property: maxActive=10
2007-01-27 20:51:21,897 ERROR [main] [] Versions - DB Version Mismatch: ours="36" from DB="26"
2007-01-27 20:51:21,901 FATAL [main] [] soap - Unable to start servlet
java.lang.RuntimeException: Data version mismatch. Reinitialize or upgrade the
backend data store.
There's your problem.
This can be a very bad error, so please make sure you have a good backup!
I'd suggest re-running the upgrade script. . .but make sure you have a backup!