Icouldnt open the wp dashboard/ admin.
I had the following error message
Fatal error: Call to undefined function update_options() in /home/df4789/public_html/slimmingandobesity.com/wdpress/wp-content/plugins/wordpress-seo/admin/class-admin.php on line 441
Following the support at wdpress the suggestion is to edit line 441 and changed the line to update instead of updates
however - I have had to disable the plugin through cpanel and havent had the guts to reinstall.