Error Code 36 trying to load Lightroom catalog in new LRC Installation

I just upgraded my Apple iMac computers and cannot get an existing catalog to load.  Before shutting down the old iMac, I saved the catalog to an external drive.  On my new computer running Monterey OS, I have a fresh install of Lightroom Classic.  I have tried both opening LRC and then Open Catalog, or, going to my external drive and double clicking on the lrcat file and get mostly the same results.

1. Double clicking on the lrcat file:  I get an error message that says "Failed to initialize pixel-mask storage.  Failed to create lock file inside the folder xxxxxxxxxx (the file name of the lrcat that i'm trying to open, not a folder).  The process cannot access the folder because it is being used by another process. 

2. From LRC, Open Catalog - there is an initial message saying that the catalog needs to be repair, and then I get the Failed to Initialize Pixel-mask storage. 

When I try to copy/paste to another hard drive, I get "The Finder can't complete the operation because some data in Lightroom Catalog xxxxxx" can't be read or written". All permissions are open that I can see and there is no reason why it shouldn't copy/paste.  Tells me its something in the file and not the hard drive.

I've spent a couple hours trying to find and understand possible solutions, but I'm not finding anything that seems to be the ticket to fixing this.  Any help at this point would be greatly appreciated.