well it does seem to be a RedXIII problem (you can check this by taking him out of your party and seeing if the error still happens), but if you just updated to a new version of Aali's driver the error has probably always been there but only just started showing, you can just add this line to the ff7opengl config file
disable_popup = yes
to stop these messages from appearing in the later versions of his driver (the problem will still be there but it wont show, and since it isn't a major problem this may be the best solution for you).