File not found

[dennishmiller]

New problem here. I have a catalog of 500 files. I tried to export all 500 at once but LR hung up (stalled after 4 hours). So I am now exporting them 100 at a time. All are in the same folder (Mac). The first 2 batches of 100 each exported fine but the third batch returns an error that all 100 cannot be found. I can view them in Finder and of course they are all right where the should be. When I choose show missing files in the LIbrary, nothing is missing. Any clues?

[ManiacJoe]

Which version of the Mac OS?

Which exact version of Lightroom?

External drive that goes to sleep?

[dennishmiller]

High Sierra (cause I need Wine, and I have made many slideshows previously).

Ver # 9.4 Classic

It is an external drive, but it is set never to sleep.

At this point, I have made and exported 2 slideshows (as MOV) using my normal routine. The individual shows select and use 100 files from the 1200 in the catalog. When I attempt to make a third slideshow, the Export progress bar goes no where and the program hangs up (when working, each slideshow takes about 5 - 6 minutes to complete and write to disc as a MOV file). I have to reboot the computer to continue with a working export.