My friend set up my website for me & then showed me how to maintain it - i.e. add pictures & change wording or layout. And I went in today to make some updates and noticed that the new version of Word Press was available, so I clicked on the link to upgrade it & the installation failed. And then I got the error below & my site is down
Fatal error: Call to a member function register_handler() on a non-object in /home/mosberry/public_html/wp-includes/media.php on line 1304
Can someone let me know what I need to do now? Or how I can revert back to the previous version? I've never set up a website on Word Press before, so I'm not sure what to do or what goes into it. Are there files on my friend's computer that are needed for the upgrade?