Fatal error: Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in /var/www/PHP_library/XMLsite/navigation.class.php:170 Stack trace: #0 /var/www/PHP_library/XMLsite/templates/HP_booksite_style/site_template.class.php(128): navigation->buildNav('listitemtop', Array) #1 /var/www/PHP_library/XMLsite/templates/Landy_style/template.php(61): site_template->header() #2 {main} thrown in /var/www/PHP_library/XMLsite/navigation.class.php on line 170