Answered
Slideshow music still reports error in LR Classic v11.2 - moved to Bugs
I have moved the details of this to a Bug report, under a similar title.
Finally, after contacting customer support, the issue has been resolved.
The file and folder permissions for LRC had become corrupted or changed.
The fix was to go to the Mac 'System Preferences\Security & Privacy' and under the 'Privacy' tab find 'Files and Folders' in the scroll menu. Then check that 'Adobe Lightroom Classic' has access to the necessary and appropriate folders; Removable Volumes, Downloads Folder, Documents Folder and Desktop Folder.
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