Fatal error: Call to undefined function filter_input()
Fatal error: Call to undefined function filter_input() in /PATH_TO_WORDPRESS/wp-content/plugins/wordpress-seo-premium/PATH_TO_FILE.extension on line ###
This errors means that your webhost has actively disabled the PHP filter extension which is shipped with PHP and enabled by default. Unfortunately, unless you’re an administrator on the server, you can’t solve the problems yourself.
Please contact your webhost and ask them to fix these issues.