This may be a plugin or theme conflict. Please attempt to disable all plugins, and use one of the default (Twenty*) themes. If the problem goes away, enable them one by one to identify the source of your troubles.
If you can install plugins, install “Health Check”: https://ww.wp.xz.cn/plugins/health-check/ On the troubleshooting tab, you can click the button to disable all plugins and change the theme for you, while you’re still logged in, without affecting normal visitors to your site.
I tried that (turned off all plug-ins and used one of the Twenty themes), but still get the error.
What version of PHP are you running?
Huh, yeah that shouldn’t be a problem. I wonder if something is up with the PHP configuration.
Can you try PHP 7.2 easily? That should be a quick way to rule that out.
It was doing it with 7.2, so I updated to 7.3 just to see if that helped (but it didn’t).
I just switched themes and it’s working now. Not sure why it didn’t work when I tried the 2019 theme.
Have you made any modifications to your copy of the Twenty Nineteen theme?
