I am trying to upgrade one of my moodle instances. It is currently at 2.3.2. running on a WAMP 2.2 server.
I have tried each of the upgrade paths:
2.3.2 - 2.3.11 - 2.4.9
2.3.2 - 2.4.9
2.3.2 - 2.5.5
2.3.2 - 2.6.2
During each upgrade, moodle steps through the initial announcement of a new code version, the server check, the plugins check, and then during the DB upgrade, I get this error:
After each fail, I restore the current 2.3.2 DB to the test_instance DB - and start with a different moodle version listed above and start over.
I have tried removing the qtype tables, which does not seem to intelligent on my part and results in data loss, which is no good. I have tried commenting out the throw line in the php file generating the error, but that's no good either, as another error is generated further down in the file.
I have tied running the question upgrader in the site admin block, which does not report any questions needed to convert.
This error is reported in other forums/threads below, but I do not see a solution.
http://community.bitnami.com/t/cannot-upgrade-moodle-database-to-2-5/13771
https://moodle.org/mod/forum/discuss.php?d=230911#p1003460
Thank you for any insights/workarounds.