I just upgraded to vbgallery 2.1 and had just upgraded vb to 3.6.4 and am receiving this same error.
Disregard my post, I figured it out. Somehow I uploaded all the files from the Forums directory but not the Gallery directory. I didn't get much sleep last night
Well I've just got the exact same error on our our forums over at aacircle.
Do I need to create this table vb3_adv_gallery_categories to fix the problem? These error messages come about twice a week, so it's very rare considering the volume on our boards.
Ok, found out the reason why it is only occurring twice a week. Because everytime the vbSEO sitemap scheduled task kicks in, that's when the trouble occurs.