Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method BasicSEO::init() cannot be called statically in /customers/5/c/a/yzkoeleservice.dk/httpd.www/administration/wp-includes/class-wp-hook.php:286 Stack trace: #0 /customers/5/c/a/yzkoeleservice.dk/httpd.www/administration/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array) #1 /customers/5/c/a/yzkoeleservice.dk/httpd.www/administration/wp-includes/plugin.php(453): WP_Hook->do_action(Array) #2 /customers/5/c/a/yzkoeleservice.dk/httpd.www/administration/wp-settings.php(327): do_action('plugins_loaded') #3 /customers/5/c/a/yzkoeleservice.dk/httpd.www/administration/wp-config.php(90): require_once('/customers/5/c/...') #4 /customers/5/c/a/yzkoeleservice.dk/httpd.www/administration/wp-load.php(37): require_once('/customers/5/c/...') #5 /customers/5/c/a/yzkoeleservice.dk/httpd.www/administration/wp-blog-header.php(13): require_once('/customers/5/c/...') #6 /customers/5/c/a/yzkoeleservice.dk/httpd.www/index.php(17): require('/customers/5/c/...') #7 {main} thrown in /customers/5/c/a/yzkoeleservice.dk/httpd.www/administration/wp-includes/class-wp-hook.php on line 286