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Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method OpenGraphProtocol::add_namespace() cannot be called statically in /homepages/28/d312364190/htdocs/wp-includes/class-wp-hook.php:289 Stack trace: #0 /homepages/28/d312364190/htdocs/wp-includes/plugin.php(206): WP_Hook->apply_filters('lang="de-DE"', Array) #1 /homepages/28/d312364190/htdocs/wp-includes/general-template.php(4099): apply_filters('language_attrib...', 'lang="de-DE"', 'html') #2 /homepages/28/d312364190/htdocs/wp-includes/general-template.php(4114): get_language_attributes('html') #3 /homepages/28/d312364190/htdocs/wp-content/themes/twentyseventeen/header.php(16): language_attributes() #4 /homepages/28/d312364190/htdocs/wp-includes/template.php(730): require_once('/homepages/28/d...') #5 /homepages/28/d312364190/htdocs/wp-includes/template.php(676): load_template('/homepages/28/d...', true, Array) #6 /homepages/28/d312364190/htdocs/wp-includes/general-template.php(48): locate_template(Array, true, true, Array) #7 /homepages/28/d312364190/htdocs/wp-content/themes/twentyseventeen/404.php(13): get_header() #8 /homepages/28/d312364190/htdocs/wp-includes/template-loader.php(106): include('/homepages/28/d...') #9 /homepages/28/d312364190/htdocs/wp-blog-header.php(19): require_once('/homepages/28/d...') #10 /homepages/28/d312364190/htdocs/index.php(17): require('/homepages/28/d...') #11 {main} thrown in /homepages/28/d312364190/htdocs/wp-includes/class-wp-hook.php on line 289