This has been happening for over a couple of years now. While it isn't extremely critical for my regular use of LR; it still is irritating.
When I open the Creative Cloud Desktop, there is a cloud with an "!".
I click on the cloud and it opens a window that contains the following items.
1. my total "Cloud Storage" bar with the current amount used out of the total available.
2. File synciing (which works fine and is "up to date".
3. Red Triangle with "!" and error message "Libraries sync error", "Sorry, your libraries didn't sync", and a button to click on to run the "sync".
When I try to run the sync, it appears to be working until it gets to 85% at which point it crashes and re-posts the same error message.
How about some help resolving that long standing failure?
Windows 10 fully updated
Lightroom Classic version: 11.4.1 [ 202206241800-b406ce4c ] License: Creative Cloud Language setting: en Operating system: Windows 10 - Business Edition Version: 10.0.19044 Application architecture: x64 System architecture: x64 Logical processor count: 24 Processor speed: 3.6GHz SqLite Version: 3.36.0 Built-in memory: 65480.8 MB Real memory available to Lightroom: 65480.8 MB Real memory used by Lightroom: 1241.5 MB (1.8%) Virtual memory used by Lightroom: 2218.4 MB
LIGHTROOM FULL SYSTEM DATA DUMP. Available if requested.