This is the error I get when I load any of my sites but one:
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
The error showed about 2 hours ago caused by no obvious reasons… nothing has been moderated to cause it.
It happened yesterday to thousand (or more?) of wordpress users.
The mainly reasons are plugins, so disable them all.
If it still shows, then its probably caused by your theme
you can change it or upload it on another blog just to be sure
Problem for me was a popup plugin.