Lightroom Classic 15.1 Catalog Unknown I/O Error

Question

Recently upgraded to 15.1 and started getting the dreaded "unknown error has occurred" on individual photos along with the exclaimation point in the black circle on the thumbnails. Full disclosure: these are Nikon NEF files.

I narrowed it down to files that had an associateed .xmp file, but that file was deleted. (I use Photomechanic to rate/cull and then import, so I delete the xmp's after import.)

I could not use the Metadata > Save option on these files as it would throw an "unknown i/o" error, I assume because it was looking for the deleted xmp.

Reverted back to 15.0.1 and the errors all went away.

By @akiramedia

So this has nothing to do with .xmp files being present or absent. It seems to be a bug, which Adobe claims to have fixed, but hasn't really been fixed according to many reports. As far as I know, there is no solution yet other than to revert back to earlier versions of LrC.

dj_paige · Accepted Answer

Recently upgraded to 15.1 and started getting the dreaded "unknown error has occurred" on individual photos along with the exclaimation point in the black circle on the thumbnails. Full disclosure: these are Nikon NEF files.

I narrowed it down to files that had an associateed .xmp file, but that file was deleted. (I use Photomechanic to rate/cull and then import, so I delete the xmp's after import.)

I could not use the Metadata > Save option on these files as it would throw an "unknown i/o" error, I assume because it was looking for the deleted xmp.

Reverted back to 15.0.1 and the errors all went away.

By @akiramedia

So this has nothing to do with .xmp files being present or absent. It seems to be a bug, which Adobe claims to have fixed, but hasn't really been fixed according to many reports. As far as I know, there is no solution yet other than to revert back to earlier versions of LrC.

Aleke · Answer

Hi @akiramedia, thanks so much for reaching out!
Does this error happen every time with the same photos, or does it pop up inconsistently?
As a first step, it often helps to reset your Lightroom Classic preferences:
https://adobe.ly/4psLBeB
If that doesn’t do the trick, could you share your System Info with us? You can find it in Photoshop under Help > System Info. Just copy everything into a text file and attach it here, or feel free to share it via Google Drive, WeTransfer, or any file‑sharing service you prefer.
Thanks!
Alek

Sign up

To post, reply, or follow discussions, please sign in with your Adobe ID.

Sign in to Adobe Community

To post, reply, or follow discussions, please sign in with your Adobe ID.