'SyntaxError: Unexpected Identifier' in System Settings / Screen Saver pane

In macOS Sonoma, you may see the following orange colored error message:


This is due to macOS Sonoma screensaver related bugs.

We have engineered a fix.

If you are making screensavers for use on macOS Sonoma, please upgrade to version 6.8.8 or later and re-build and re-install your screensaver.

See iScreensaver Designer 6 Release Notes for more info