[php]Call to a member function query() on a non-object

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Hello dear otland users!

I've got problem with gesior simple forum ( http://otland.net/f118/simple-forum-script-48548/ )

This script should work, but it gives me following error when i try to open localhost/forum.php

Fatal error: Call to a member function query() on a non-object in C:\xampp\htdocs\forum.php on line 128

Here's the code at line 128

    $info = $SQL->query("SELECT `section`, COUNT(`id`) AS 'threads', SUM(`replies`) AS 'replies' FROM `z_forum` WHERE `first_post` = `id` GROUP BY `section`")->fetchAll();

And yes, I've made tables correctly, it's not fault of tables. My php - 5.2.11, I'm using XAMPP.