I have been running a bulk smush of my nextgen gallery images all day long with the WP Smush Pro plugin. All was fine until now- it's stuck at 8247 of 14482 attachments and the following error messages showed up underneath: "We couldn't find the metadata for the image, possibly the image has been deleted."
Please note that I did delete some images recently (before the bulk smush) as I am trying to free up storage.
Does that mean that the processing is finished and there were really only 8247 images to smush? Or is there more processing to do? I was tempted to refresh the page and restart but I cannot spent many more hours on this.
Other info- I do have W3 Total Cache and I'm using Maxcdn. However, I have had no issues until now and the bulk smush was running for about 7 hours with no problems.
Thank you for any help you can give with this.