Lightroom Classic -V10 catalogs

[Squishysdad]

Just updated to Lightroom Classic CC latest version (release 10,11) and it cant read any of my V10 catalogs.  All my catalogs that were backed up last week will not open.

Anyone else seeing the same?

{Moved from Lightroom Cloud to Lightroom Classic Forum by Moderator} 

[Jao vdL]

What kind of error message do you get?

[ManiacJoe]

Mac or Windows? Which version of the OS?

Which exact version of Lightroom?

What is the exact wording of the error message?

What happens if you try the data migration again by opening the 9.x version of the catalog?

[Squishysdad]

Windows 10. Light room classic Release 10.11 Build 202101041610-C69AA4E

Error message: Unexpected error. The catalog could not be opended due to an unexpected error.

Version 9 catalog opens no problem, but I loos everything that was changed or edited between version 9 and 10.11