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 /homepages/15/d473419171/htdocs/clickandbuilds/PhilippGrimmSondermaschinenservice/wp-includes/class-wp-hook.php:286 Stack trace: #0 /homepages/15/d473419171/htdocs/clickandbuilds/PhilippGrimmSondermaschinenservice/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array) #1 /homepages/15/d473419171/htdocs/clickandbuilds/PhilippGrimmSondermaschinenservice/wp-includes/plugin.php(453): WP_Hook->do_action(Array) #2 /homepages/15/d473419171/htdocs/clickandbuilds/PhilippGrimmSondermaschinenservice/wp-settings.php(327): do_action('plugins_loaded') #3 /homepages/15/d473419171/htdocs/clickandbuilds/PhilippGrimmSondermaschinenservice/wp-config.php(80): require_once('/homepages/15/d...') #4 /homepages/15/d473419171/htdocs/clickandbuilds/PhilippGrimmSondermaschinenservice/wp-load.php(37): require_once('/homepages/15/d...') #5 /homepages/15/d473419171/htdocs/clickandbuilds/PhilippGrimmSondermaschinenservice/wp-blog-header.php(13): require_once('/homepages/15/d...') #6 /homepages/15/d473419171/htdocs/clickandbuilds/PhilippGrimmSondermaschinenservice/index.php(17): require('/homepages/15/d...') #7 {main} thrown in /homepages/15/d473419171/htdocs/clickandbuilds/PhilippGrimmSondermaschinenservice/wp-includes/class-wp-hook.php on line 286