InfoPath Dev

additionally ive tried to work my way through adding Odata connections for the above lists, hoping to associate the info found on a row in List A, with info on a row in List B through rules/filters, but when i successfully add the connections in infopath designer...which seem to work fine in the infopath preview (drop downs work), I get an error ...

I have a form that im trying to create, where i want to populate drop downs from a sharepoint list (List A). I have easily done this in the past, but never to a list that has a few lookup columns, or columns that are dropdown lists of their own, populated from a 2nd sharepoint list (list B). When my users create a new row on List A, they get to ...