This is odd, anyone have an idea whats going on.
When I do a buildcache it gives me this error
Uncaught Exception: Object->__call(): the method 'subpagestocache' does not exist on 'SiteTree'
but in my page.php file I have
function allPagesToCache() {
// Get each page type to define its sub-urls
$urls = array();

// memory intensive depending on number of pages
$pages = DataObject::get("SiteTree", "ClassName != 'UserDefinedForm'");

foreach($pages as $page) {
$urls = array_merge($urls, (array)$page->subPagesToCache());
}

// add any custom URLs which are not SiteTree instances
$urls[] = "sitemap.xml";

return $urls;
}

/**
* Get a list of URLs to cache related to this page
*/
function subPagesToCache() {
$urls = array();

// add current page
$urls[] = $this->Link();

// cache the RSS feed if comments are enabled
if ($this->ProvideComments) {
$urls[] = Director::absoluteBaseURL() . "pagecomment/rss/" . $this->ID;
}

return $urls;
}

function pagesAffectedByChanges() {
$urls = $this->subPagesToCache();
if($p = $this->Parent) $urls = array_merge((array)$urls, (array)$p->subPagesToCache());
return $urls;
}

I will give that a try. Whats odd, is that I have another site that I used the same code on and it works fine!
John