Export catalog preview could not be found

[Brent5C56]

When I export a catalog I get a message that photo previews could not be found for 2 of my photos. I'm not sure what this means. When I open the exported catalog I can see everything fine. Are these photos/catalog corrupted or is there something specific I could be looking at in the exported catalog to verify this problem message? Also when I exported a catalog from this new catalog I don't have any problems even tho it's the same photos. 

[dj_paige]

Please tell us the exact word-for-word error message. Also please state version NUMBER of Lightroom Classic and version NUMBER of your operating system (do not use words like "current" or "up-to-date").

[Brent5C56]

Lightroom Classic version 10.4

Mac OS Big Sur version 11.6

Here's a screen shot of the message:

 

[DdeGannes]

Just a thought, see if you can locate the files that are referred to in the error message in the  Library Module, select the files and go to the menu > Library > click "build standard previews" and see if that helps.

 

[Brent5C56]

It's fixed now but I'm not sure what did it. I deleted the exported catalog from the trash. I also made a develop adjustment on each of the 2 photos. Now I export and don't get any messages. 

[DdeGannes]

Ok the develop adjustment would have generated a update of the preview.

[JohanElzenga · Accepted solution]

Don't worry about a message like that. Just ignore it. When you open the exported catalog in Lightroom, those previews will automatically be rebuilt as soon as you see the image(s) in the grid. There is no need to do anything.