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Fatal error: Uncaught TypeError: call_user_func(): Argument #1 ($callback) must be a valid callback, non-static method GoogleSitemapGeneratorLoader::Enable() cannot be called statically in /homepages/21/d451398925/htdocs/wp_naturheilpraxis/wp-includes/class-wp-hook.php:285 Stack trace: #0 /homepages/21/d451398925/htdocs/wp_naturheilpraxis/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array) #1 /homepages/21/d451398925/htdocs/wp_naturheilpraxis/wp-includes/plugin.php(484): WP_Hook->do_action(Array) #2 /homepages/21/d451398925/htdocs/wp_naturheilpraxis/wp-settings.php(557): do_action('init') #3 /homepages/21/d451398925/htdocs/wp_naturheilpraxis/wp-config.php(91): require_once('/homepages/21/d...') #4 /homepages/21/d451398925/htdocs/wp_naturheilpraxis/wp-load.php(37): require_once('/homepages/21/d...') #5 /homepages/21/d451398925/htdocs/wp_naturheilpraxis/wp-blog-header.php(13): require_once('/homepages/21/d...') #6 /homepages/21/d451398925/htdocs/wp_naturheilpraxis/index.php(17): require('/homepages/21/d...') #7 {main} thrown in /homepages/21/d451398925/htdocs/wp_naturheilpraxis/wp-includes/class-wp-hook.php on line 285