Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method dc_jqsocialstream::header() cannot be called statically in /homepages/35/d589841998/htdocs/sites/steveambielli.com/wp-includes/class-wp-hook.php:288 Stack trace: #0 /homepages/35/d589841998/htdocs/sites/steveambielli.com/wp-includes/class-wp-hook.php(312): WP_Hook->apply_filters(NULL, Array) #1 /homepages/35/d589841998/htdocs/sites/steveambielli.com/wp-includes/plugin.php(478): WP_Hook->do_action(Array) #2 /homepages/35/d589841998/htdocs/sites/steveambielli.com/wp-includes/general-template.php(2879): do_action('wp_head') #3 /homepages/35/d589841998/htdocs/sites/steveambielli.com/wp-content/themes/steveambielli/header.php(42): wp_head() #4 /homepages/35/d589841998/htdocs/sites/steveambielli.com/wp-includes/template.php(722): require_once('/homepages/35/d...') #5 /homepages/35/d589841998/htdocs/sites/steveambielli.com/wp-includes/template.php(671): load_template('/homepages/35/d...', true) #6 /homepages/35/d589841998/htdocs/sites/steveambielli.com/wp-includes/general-template.php(41): locate_template(Array, true) #7 /homepages/35/d589841998/htdocs/sites/steveambielli.com/wp-content/themes/steveambielli/404.php(1): get_header() #8 /homepages/35/d589841998/htdocs/sites/steveambielli.com/wp-includes/template-loader.php(98): include('/homepages/35/d...') #9 /homepages/35/d589841998/htdocs/sites/steveambielli.com/wp-blog-header.php(19): require_once('/homepages/35/d...') #10 /homepages/35/d589841998/htdocs/sites/steveambielli.com/index.php(17): require('/homepages/35/d...') #11 {main} thrown in /homepages/35/d589841998/htdocs/sites/steveambielli.com/wp-includes/class-wp-hook.php on line 288