I'm trying to upgrade 37 old assignments (2.2) to the new assignment version. I've already upgraded about 100 of them without an issue. However, when I select upgrade all 37 assignments at once I get the "Multiple records found, only one record expected." error message (debug message below) . If I select a few assignments to upgrade I get the same message. Does anyone know why I can't upgrade these last 37 assignments? I really need to disable the old assignment 2.2 module so teachers will stop using it. If I disable it now, their current 2.2 assignments will disappear. Any help would be greatly appreciated.
Moodle 2.5.3+, Debian 7, PHP 5.4.4, MySQL 5.5.31