Ahh, I see the issue now. Looks like the original source was disconnected, maybe because the table was deleted and then restored which is when that happens or at least one of the probable causes. Will ask if that could be restored, otherwise, it may be easier to generate a new connection/table.
Do you have a working table that has the same workflow that you could duplicate and use as a new template for future imports? that may be the best way to get around this for now