"This file could not be found" but original location has not changed

[Ryan23794937zmu7]

I'm no expert, but quite a few photos in my LR catalog now say they cannot be found but when I go to "Show In Finder" every single photo I've revied is in the same original location. 

I've done Library-> Find All Missing Photos with no success, it just seems liek LR is not seeing the photos in the original source whatsoever. 

[GoldingD]

see:

https://www.computer-darkroom.com/lr2_find_folder/find-folder.htm

[dj_paige]

It really doesn't matter if you did anything or not, the important point is that Lightroom Classic thinks the files aren't there. So you need to follow the instructions from @GoldingD and fix this.