Fatal error: Class 'tNG_dispatcher' not found 

If you get this error search for the following code-blocks:

// Make a transaction dispatcher instance
$tNGs = new tNG_dispatcher("../");

// Load the tNG classes
require_once('../includes/tng/tNG.inc.php');

Make sure the second block is parsed BEFORE the first one.
Simply change them around to load the tNG class first before parsing the tNG_dispatcher

// Load the tNG classes
require_once('../includes/tng/tNG.inc.php');

// Make a transaction dispatcher instance
$tNGs = new tNG_dispatcher("../");

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