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powlean
User level: Level 1 (4 points)

How to resolve 'missing setter or variable' error when reinstalling mac OS Sierra?

Hello , I try to restore Mac OS Sierra , but I receive this error : failed to Connect (continuePane) outlet from (IASetupwindowcontroller) to (Nstextfield): missing setter or variable



[Re-Titled by Moderator]

Original Title: Reinstallando Mac OS Sierra

Posted on Nov 2, 2026 1:13 PM

2 replies

kaz-k
User level: Level 9 (53,902 points)

Nov 2, 2026 1:33 PM in response to powlean

Hi,

This error usually means your macOS Sierra installer file is expired, damaged, or your Mac's date and time are incorrect, causing the installer's security certificate to fail verification.

Quick Fixes

  • Check system date: An expired certificate or wrong system clock is the most common trigger. Open Terminal from the Utilities menu during recovery and type date to verify if the year is correct. If it is wrong, set it manually (e.g., date 061212002016 for June 12, 2016) before running the installer again.
  • Re-download or recreate the installer: The Apple Support Archive installer packages for older OS versions can get corrupted or lose valid signatures over time. Creating a fresh bootable USB installer using a verified DMG often bypasses the issue.


powlean Author
User level: Level 1 (4 points)

Nov 2, 2026 1:45 PM in response to kaz-k

Hi,

Now I try to set a system date … if no work do you suggest me to create bootable USB ?

Originally posted at discussions.apple.com/thread/256387767