Program Error when saving out video in Photoshop

Hey everyone, hoping someone has an answer for this.

I am creating a video in Photoshop. It is made up of multiple files that I will eventually merge in iMovie. Ive exported 3 of the 5 photoshop files into mp4s with no problem. But when I attempt to export the other 2, I keep getting the pop up," Cannot save do to a program error". When I worked on the files yesterday this message never came up. Any suggestions?