When I first time run website it is always show me this error, after refresh it is works normal. This kind of issue not depend of running system. The same with *nix or windows.
Fatal error: Call to a member function isAllowed() on a non-object in D:\WebServer\domains\745221\public_html\app\plugins\Security.php on line 89
Fragment of code has taken from sample invo-master (http://snag.gy/lc656.jpg)
Any idea? What problem is?