I have just logged into my site and automatically upgraded a couple of plugins (my site http://www.hadfieldeducation.com) and I received a message
Fatal error: Call to undefined method stdClass::set_prefix() in /home/hadfield/public_html/wp-includes/load.php on line 337
I reviewed this forum to find posts that suggested I reinstall a new WP folders and all files except the wp/content and wp-config file. (heres the link to the post (http://wordpress.org/support/topic/wp-installation-failed-fatal-error-call-to-undefined-method?replies=8)
I have used FileZilla to upload but I did not clean install FileZilla.
I now have a new error message
Warning: require(/home/hadfield/public_html/wp-includes/class-wp.php) [function.require]: failed to open stream: No such file or directory in /home/hadfield/public_html/wp-settings.php on line 70
Fatal error: require() [function.require]: Failed opening required '/home/hadfield/public_html/wp-includes/class-wp.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/hadfield/public_html/wp-settings.php on line 70
My website is business related and I really need to reslove this issue ASAP.
Any help or suggestions warmly recieved.