Error when getting a page's children

[desbest]

I'm using this code to get a page's children

<?php
            //$selector = "template=chapter";
            $skyscrapers = $pages->find("$page->children");
            foreach($skyscrapers as $skyscraper) {
                echo "<li><a href='$skyscraper->url'>$skyscraper->title</a></li>";
            }           
?>

It works on one of my pages, but when I go to another one of my pages, I get the following error

Error: Exception: Unknown Selector operator: '' -- was your selector value properly escaped? (in C:\xampp\htdocs\rasarouting\wire\core\Selectors.php line 396)

Both pages have children pages

How do I fix this?

[Robin S]

To get a page's children...

$skyscrapers = $page->children();