Hi All! Has anyone ever received this error message when trying to open Lightroom Classic on a Mac?

Was this immediately after updating/upgrading LrC?

https://helpx.adobe.com/creative-cloud/kb/troubleshoot-download-install-logs.html#error205

Someone else recently reported the same error message:

https://community.adobe.com/t5/lightroom-classic-discussions/lightroom-classic/m-p/12405457 

They never responded to the suggestions made nor reported back that they solved (or didn't solve) the problem.  

I think your best option is to contact support, as directed by error message.