I get a Server Busy error each time I launch Lightroom 6.14
I needed to flatten and rebuild my Windows 10 PC with a clean install of Windows 10. I've installed all Windows 10 updates.
I re-installed Lightroom 6.14 which i've been using successfully for a number of years. However, after the re-install of Lightroom 6.14, each time I launch Lightroom I get the following error:

When I click the Switch To button it just opens the Windows 10 menu and sits there for about 2 to 3 minutes eventually going away and Lightroom finished launching.
What is causing this and how do I fix it?