Fatal-error message frustrating you and preventing your site from loading? So with the most recent release of WordPress 4.7.3 I received a ton of emails with panic-stricken developers asking how to correct the Fatal error: Call to undefined function apply_filters() in /public_html/wp-includes/load.php on line 316 or 317.
This issue will typically happen when trying to use the auto update feature. Don’t panic! Hopefully you or your hosting company have been doing daily back-ups. The back-ups are there to help recover any lost data.
The good news is that it’s not that bad. You’ll see a ton of posts suggesting that you need to do a manual install of WordPress. You don’t need to waste your time or your clients.
Permissions trouble is the cause
This problem was caused by the
wp-settings.php. Due to permissions trouble this file was not updated while using auto-update. Replacing this file with the latest
wp-settings.php solved the trouble. That’s right! The
wp-settings.php from the new WordPress download is all you need. Using your FTP simply drop and update. Open another browser and perform a hard refresh (crtl + f5) and your site will come right back up.
Hope this helps.
For more information on website fixes check out http://60labs.com/knowledge-base/