Cannot export an entire gallery without getting errors

Everytime I try to export any size of gallery, Lightroom fails and gives me the error of error couldn't apply content credentials, or it just says it cannot export the files. This is getting very frustrating because then I have to go re-export those files, on a 200+ gallery and I have to do it multiple times for one gallery. The wedding gallery i just exported took 15 exports to export 450 images. This is unacceptable and costing me valuable time I could be using on other clients.