Fatal error: Call to a member function getPermissionKeyByHandle() on a non-object - function

Question

Hello I get the following messages at my site www.csvc.nl
Fatal error: Call to a member function getPermissionKeyByHandle() on a non-object in /var/www/vhosts/csvc.nl/httpdocs/cms/updates/concrete5.6.0/concrete/core/models/permission/response.php on line 53
The PHP code is:
<?php
defined('C5_EXECUTE') or die("Access Denied.");
class Concrete5_Model_PermissionResponse {
protected $object;
protected $allowedPermissions = array();
protected $customClassObjects = array();
protected $category;
static $cache = array();
public function setPermissionObject($object) {
$this->object = $object;
}
public function getPermissionObject() {
return $this->object;
}
public function setPermissionCategoryObject($category) {
$this->category = $category;
}
public function testForErrors() { }
public static function getResponse($object) {
$r = PermissionCache::getResponse($object);
if (is_object($r)) {
return $r;
}
$category = PermissionKeyCategory::getByHandle(Loader::helper('text')- >uncamelcase(get_class($object)));
if (!is_object($category) && $object instanceof Page) {
$category = PermissionKeyCategory::getByHandle('page');
}
$txt = Loader::helper('text');
$c1 = get_class($object) . 'PermissionResponse';
if (!class_exists($c1)) {
$c1 = 'PagePermissionResponse';
}
$pr = new $c1();
$pr->setPermissionObject($object);
$pr->setPermissionCategoryObject($category);
PermissionCache::addResponse($object, $pr);
return $pr;
}
public function validate($permission, $args = array()) {
$u = new User();
if ($u->isSuperUser()) {
return true;
}
$pk = $this->category->getPermissionKeyByHandle($permission);
if (!$pk) {
print t('Unable to get permission key for %s', $permission);
exit;
}
$pk->setPermissionObject($this->object);
return call_user_func_array(array($pk, 'validate'), $args);
}
public function __call($f, $a) {
$permission = substr($f, 3);
$permission = Loader::helper('text')->uncamelcase($permission);
return $this->validate($permission, $a);
}
}
Does anybody knows what the problem is?

Answer 1

I had a similar issue on an incomplete 5.6.0 upgrade.
Concrete 5 has a core upgrade troubleshooting guide
For me, I just had to do this on my site: http://example.com/index.php/tools/required/upgrade and use the upgrade button.
FYI, this added entries to PermissionKeyCategories and other tables (which existed, but were empty).