emanuele smells bug
Try that one (that is the first most evident error in the file), open ScheduledTaks.class.php (directory sources/subs), search:
while ($row = $db->fetch_assoc($request))
{
require_once(ADMINDIR . '/ManagePaid.controller.php');
removeSubscription($row['id_subscribe'], $row['id_member']);
}
and replace it with:
require_once(SUBSDIR . '/PaidSubscriptions.subs.php');
while ($row = $db->fetch_assoc($request))
{
removeSubscription($row['id_subscribe'], $row['id_member']);
}