Catalog not being recognized upon starting Lightroom Classic

[SrryBud]

Upon trying to start LrC I get a notification reading:

"The Lightroom catalog named “lightroom_catalog..” cannot be opened because it is not valid. Would you like to select a different catalog?

The catalog is not recognized as a valid catalog.

The catalog is found in D:.../.../.../LightroomCatalog.lrcat."

I have tried reinstalling the program and also have moved a copy to a different drive to start it from there and even to open the backups (can't open them due to protection). All without success. Does anyone have a solution to this?

Last time I used LrC was a couple of days ago in which everything went seamlessly, I have never encountered this issue before. Today when revisiting lightroom I noticed the Change in Adobe's logo indicating an update(right after a notification popped confirming this). I work on a desktop Microsoft 10. I have added a screenshot of the notification along with the folder where the catalog is found (Dutch, see translation above).

[dj_paige]

Also, what is the full path, name and extension of the catalog file according to your operating system?

[SrryBud]

Thx, done!

[GoldingD]

Did that lock file exist before starting LrC?

Currently, with LrC closed, does that lockfile still exist?

[SrryBud]

The Lock file did not exist prior to initiating LrC nor does it exist after having closed it down.

[GoldingD]

good

[GoldingD]

Ok, so the fact that you have located the catalog on OneDrive, went right past me, failed to notice. (see your attachment) So you are placing a catalog on the cloud,

LrC does not like to run with catalogs located on various network devices. For example placing the catalog on a NAS is a nightmare, might as well be verbotten, or a remote Server. Photos, hoever, can.

So what about OneDrive? hmm

try relocating the catalog to an actual local hard drive.

.

/EDIT/FOLLOWUP/

Apparently LrC may work with the catalog located on OneDrive, see:

https://community.adobe.com/t5/lightroom-classic/lightroom-classic-cc-and-onedrive/td-p/10328829?pag...

and from the above, see:

https://community.adobe.com/t5/lightroom-classic/lightroom-onedrive-a-match-made-in-heaven/td-p/6905...

and

https://www.lightroomqueen.com/community/threads/how-to-run-lightroom-from-a-onedrive-sync-folder.25...

[GoldingD]

By the way, that attachment, would work better if that image was in the actual posting, not an attachment, mind you not all items will fit in the post

[SrryBud]

Thank you for your suggestions.

Just to be sure I've copied lightroom to a different and local driver. To my disappointment, the issue remained. I have been looking into the forums you've shared with me. The opinions vary and there hasn't been a single answer given solving the issue. I will continue trying to fix it for a while, but at some point, I might just create a new catalog. Before I end this message. Someone on the other forums touched upon giving Lr permission to edit Onedrive files. They don't touch upon how to exactly do this so I was wondering if anyone knew?