I too am getting:
Fatal error: Call to undefined function get_taxonomies_for_attachments() in /websites/123reg/LinuxPackage22/ca/bb/ie/cabbieblog.com/public_html/blog/wp-admin/menu.php on line 67
I can't log into my administrator panel
I've reset my plugins folder via FTP or the file manager provided in your host's control panel as follows:
1. Via FTP or your host's file manager, navigate to the wp-contents folder (directory)
2. Via FTP or your host's file manager, rename the folder "plugins" to "plugins.hold"
3. Login to your WordPress administration menus (/wp-admin)
4. Via FTP or your host's file manager, rename "plugins.hold" back to "plugins"
WP is still not allowing me to log in