Silent Knight reports 'Error updating the Property list' on MacBook Air with macOS Big Sur

MacBook Air running Big Sur and using Silent Knight from Eclectic Light Company, Howard Oakley.

Silent Knight reports Error updating the Property list


I have removed SN and cleaned out all the supporting files, reinstalled the app but the issue is still there.

Could anyone please advise?



[Re-Titled by Moderator]

Original Title: Silent Knight reports error

Posted on Nov 9, 2025 2:45 AM

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Question marked as Top-ranking reply

Posted on Nov 9, 2025 4:01 AM

[…]Silent Knight reports Error updating the Property list[…]

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Have At least macOS Big Sur v. 11.5

macOS 11.5 or later is required. See here: Updates for SilentKnight, Mints and SystHist - MacMegasite


Turn Off All VPNs:

Are you Using a VPN? If so, turn it off.

5 replies

Nov 9, 2025 8:55 AM in response to Lance.scs

Hi, my problem is that I have Big Sur 11.7.10 and also installed the Silent Knight update 2.12: BTW, I have tried previous versions as well, with the same result. I have removed the.plis file and restarted SN, it made no difference.

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Reinstall this, Backing Up First:

In would email the Developer of this app, requesting a new license code. If this is their domain, then this is the Gogole

linkmtonuse: “contact us” site:silentnight.co.uk


To uninstall it, drag its icon from the Applications folder into the Trash, and then restart your computer. Proceed with the install, and then restart after the install.

IMPORTANT: Be certain to create a Time Machine Backup of your Mac with an external drive. That way, you can have something to restore your Mac from , should the reinstall cause failure.

hard drive

Nov 17, 2025 1:45 AM in response to TheLittles

Thanks for the reply

The link however refers to a bedding company.

Furthermore, I have reinstalled SN ànd macOS, made a clean install and reverted back to Catalina, just to find out that it all didn't make any difference.

All other Macs are fine, it is just the MacBook Air giving troubles.

I'd appreciate any advise or instruction

Thank you all in advance

Silent Knight reports 'Error updating the Property list' on MacBook Air with macOS Big Sur

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