I got this similar error since yesterday.
Fatal error: Call to undefined method Settings::printLinks() in /home/admin/server/index.php on line 87 Call Stack: 0.0001 644544 1. {main}() /home/admin/server/index.php:0
I can’t figure it out.
The only thing I did is to install 404 Redirected plugin. Which I uninstalled after noticing the error at the top of my page.