I’m currently in the process of upgrading an EE 1.x installation to 2.x. We have several add-ons installed that alter the database from its original structure, and it seems to be causing a problem during the upgrade. Before running the 1-to-2 upgrade, I upgrade to 1.7.3 and undo our gypsy fields. I’ve attached a screenshot of the error i’m experiencing along with other details.