PSE 2020 catalog could not be opened. Internal programming error occured
I cannot open my PSE 2020 catalog - it gives me the error "The catalog could not be opened. An internal programming error occurred."
The only advice I have been able to find refers to PSE 2018 on this thread, https://community.adobe.com/t5/photoshop-elements-discussions/catalog-could-not-be-opened-internal-programming-error-occurred/m-p/9982739 ,which seems to be along the lines of using the convert catalog feature. This doesn't seem to work for me - I can't find any catalogs to convert.
Before this, I had moved the catolog, which is on a removable drive, from my (Windows 11) laptop to my (Windows 10) desktop. Something confusing happened with OneDrive on the desktop downloading files. For reasons I do not understand, some images ended up linked to the onedrive folders on the C: drive rather than the removable drive.
I stopped synching to onedrive and tried to fix it by moving files within organiser. That fixed some cases, and I tried to reimport the remaining ones, but PSE wouldn't reimport them as they were detected as duplicates.
Although the situation was stll a bit confused, I thought that I had mostly tidied it up. But, when I moved the drive back to my laptop, I got this error when I tried to start Organiser and I now I can't open it on the desktop either. So I am locked out of my photo library - how do I fix this?
I guess this is not a complete disaster as the images are still on the disk and I have a backup of the catalog that is maybe a few weeks old but it would be a miserable chore to recover the work I have done since the last backup.
