Receiving this error on some sub-pages of my site https://theccsn.com after most recent update. I have verified the following versions (fully up to date):
It might be the issue of version compatibility. Please make sure your WordPress version and the PHP version(7.4) are updated as per our version compatibility page. It is also recommended by WordPress. Please have a look at this article.
I would suggest you troubleshoot with a few of the common issues before we investigate your settings.
If none of those work, It would be best if you could copying your live website to your staging area. and send your details in a secure note so that we can investigate your setting without breaking your live site. Please provide the following details
WordPress Login URL
Admin level username and password
FTP Details
You can find the Secure Note button at the bottom of your posts