Issue: Suddenly Unqualified_id error on juce namespace declaration

Not sure what is going on here, or why. I have both restarted and re-initialized the project that I am currently working on, and suddenly I am getting "Expected Unqualified ID " on line 27 of the juce_UndoableAction.h module file within the juce_data_Structures module.

I am using the following -v:
-Juce 6.0.1
-XCode 11.3.1

*** Update ***
I ended up uninstalling and re-installing JUCE and this seems to have temporarily solved the issue. It would still be nice to have some insight into the intial cause though, lol.

Thank you!