I woke up to the same error this morning on three of my websites. The rest were fine. I deactivated the AIOS plugin, and it had no effect on the error.
After further troubleshooting, it turned out to be an issue with the WordPress 6.3 update that came down the pipe yesterday. I downloaded the core files from wordpress.org and overwrote my existing WordPress 6.3 files. That fixed all three sites with this error.
After logging into wp-admin, I got a message on the three sites with an issue that there was a database update required. Had to apply that update, then I was able to get into admin.
Then it gave me a message about the auto-update failing. I followed that link and since I was already at the current version, selected reinstall WordPress to get rid of that message. All is good now.
Hope this helps you!
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This reply was modified 2 years, 9 months ago by moodyj.
