Hi @birkok,
Uh oh, I’m afraid that’s a bit of a problem. When your upgrade failed, it left your database halfway between OJS 3.1.2 and 3.2. Only the error message can tell you how far it got. The error you’re encountering now is happening because the upgrade script is trying to execute an upgrade step that’s already been executed. See Issue in upgrading OJS 2.4 to OJS 3.x - #46 by asmecher for more information on this situation. You should always restore from backup after a failed upgrade.
Regards,
Alec Smecher
Public Knowledge Project Team