Argh- sorry, I guessed wrong. Installing pages creates that field. Since structure sort of ‘takes over’ that field- you presumably can’t use pages. But I thought they might allow it for purposes of field creation. This is definitely one you’ll need to talk to the authors about. Checking the docs might help- for example, if there’s a module- you might have to uninstall the module, uninstall pages- then reinstall the module (to have the table field created). But I’m purely guessing on this one. The error itself is purely related to the third party add on, and I’m just not up on it enough to say for sure.