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Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method plugin_kontakt_frontend::init() cannot be called statically in /homepages/13/d211052056/htdocs/kinga/wp-includes/class-wp-hook.php:308 Stack trace: #0 /homepages/13/d211052056/htdocs/kinga/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(NULL, Array) #1 /homepages/13/d211052056/htdocs/kinga/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #2 /homepages/13/d211052056/htdocs/kinga/wp-settings.php(617): do_action('init') #3 /homepages/13/d211052056/htdocs/kinga/wp-config.php(88): require_once('/homepages/13/d...') #4 /homepages/13/d211052056/htdocs/kinga/wp-load.php(50): require_once('/homepages/13/d...') #5 /homepages/13/d211052056/htdocs/kinga/wp-blog-header.php(13): require_once('/homepages/13/d...') #6 /homepages/13/d211052056/htdocs/kinga/index.php(17): require('/homepages/13/d...') #7 {main} thrown in /homepages/13/d211052056/htdocs/kinga/wp-includes/class-wp-hook.php on line 308