Attempt to access Screensaver triggers com.apple.extensionKit.errorDomain error 15

Hi there WestAnthony,

Try booting up your Mac in safe mode to see if this behavior persists.

Safe mode prevents certain software from loading as your Mac starts up. This includes login items, system extensions that aren't required by macOS, and fonts that weren't installed by macOS.

It also performs a basic check of your startup disk, similar to the more comprehensive check performed by the First Aid feature of Disk Utility.

And it clears some system caches, including font caches and the kernel cache. These are automatically created again as needed.

Learn more about how to do that here: Use safe mode on your Mac - Apple Support

Take care.

It's best to try any recommended fixes before upgrading to a new system because it might be some 3rd party software that you've installed that may be the culprit and it will be carried over to the new system.

Do try the Safe Mode boot and if that doesn't help download and run Etrecheck. Be sure to give it Full Disk access before running.

Copy and paste the results into your reply. Etrecheck is a diagnostic tool that was developed by one of the most respected users here in the ASC and recommended by Apple Support  to provide a snapshot of the system and help identify the more obvious culprits that can adversely affect a Mac's performance.

Copy the report

and use the Additional Text button to paste the report in your reply.

Then we can evaluate the report to see if we can determine the cause of the problem.

Bottom line: you don't want to go into a new system with unresolved problems with the current one.

Hey amasteboard,

Upgrading to a new macOS may resolve the issue. But, if it doesn't, the article we shared previously provides the steps to use: Use safe mode on your Mac - Apple Support

If the issue continues in safe mode

If the issue continues in safe mode, the easiest and most likely solution is to reinstall macOS. Reinstalling macOS doesn't remove your personal files, so you can do it whenever you need to.

All the best.

That's great news. Glad to hear you up and running OK again. Got to get a new M1 or M2 before I can get into Sonoma. Saving my pennies.