Help with PHP Error message?

Hey Everyone,
I am getting a weird error message all of the sudden on my page and I don't know why? Any help would be greatly appreciated!
ERROR MESSAGE
——————–
Strict Standards: Accessing static property Posts::$sessionholder as non static
CODE ITS REFERENCING
—————————-
class Posts {
public static $sessionholder;
function __construct() {
$this->sessionholder = $_SESSION;
}
———————–
Any ideas what could be…
Help with PHP Error message?

See original post by medialab