Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, first array member is not a valid class name or object in /home/minervanpollo/public/html/wp-includes/class-wp-hook.php:307 Stack trace: #0 /home/minervanpollo/public/html/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array) #1 /home/minervanpollo/public/html/wp-includes/plugin.php(474): WP_Hook->do_action(Array) #2 /home/minervanpollo/public/html/wp-includes/general-template.php(3042): do_action('wp_head') #3 /home/minervanpollo/public/html/wp-content/themes/toolbox/header.php(56): wp_head() #4 /home/minervanpollo/public/html/wp-includes/template.php(770): require_once('/home/minervanp...') #5 /home/minervanpollo/public/html/wp-includes/template.php(716): load_template('/home/minervanp...', true, Array) #6 /home/minervanpollo/public/html/wp-includes/general-template.php(48): locate_template(Array, true, true, Array) #7 /home/minervanpollo/public/html/wp-content/themes/toolbox/single.php(9): get_header() #8 /home/minervanpollo/public/html/wp-includes/template-loader.php(106): include('/home/minervanp...') #9 /home/minervanpollo/public/html/wp-blog-header.php(19): require_once('/home/minervanp...') #10 /home/minervanpollo/public/html/index.php(17): require('/home/minervanp...') #11 {main} thrown in /home/minervanpollo/public/html/wp-includes/class-wp-hook.php on line 307