@john fell - Even though you received an error dialog most of the items deleted. I have deleted the last three .lrcat files.
One of the Lightroom help pages says to not store Lightroom catalogs in the Creative Cloud storage: Lightroom and Creative Cloud FAQ
- Can I store my Lightroom catalog in the 20 GB of storage space I get with my Creative Cloud membership? No. You can't store Lightroom catalogs in the Creative Cloud, nor can you save a Lightroom catalog on a networked drive. You must store Lightroom catalogs on your computer or on a locally connected hard drive.