Can't edit pages (or anything else)

I get the following warning (and nothing else)
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘ce_filter’ not found or invalid function name in /app/public/wp-includes/class-wp-hook.php on line 286

Can someone please help?

What version of wordpress version is this with? Have you tried disabling your plugins too?