hi.. i'm getting crazy.. a Block works perfect in WAMP but get TABLE NOT FOUND in production (i've attached a screenshot)

Below my code for reproduction, very essential !
Can someone help me please ?
Thank you all in advance
Michele

<?php
namespace Concrete\Package\ReservedFiles\Block\ReservedFiles;
defined("C5_EXECUTE") or die("Access Denied.");
use Concrete\Core\Block\BlockController;
use Core;
use Database;
use Loader;
use Block;
use View;
use Group;
use User;
use UserInfo;
use Page;

class Controller extends BlockController {

protected $btTable = 'btreservedfiles';
protected $btInterfaceWidth = 600;
protected $btInterfaceHeight = 600;
protected $btCacheBlockRecord = true;
protected $btCacheBlockOutput = false;
protected $btCacheBlockOutputOnPost = false;
protected $btCacheBlockOutputForRegisteredUsers = false;
protected $btDefaultSet = 'basic';

public function getBlockTypeDescription(){return t("For handling files ");}
public function getBlockTypeName() {return t("Files");}
public function add() { }
public function edit() {}
public function validate($args) {}
function save($args){}
public function view() {}

//================= the logic ==============================

public function on_start(){
$this->set('records', $this->getAllUserGroup());
}
// --- function to list all user group to be select in ADD/Edit function
public function getAllUserGroup() {
$db = \Database::connection();
$queryAllUserGroup = "SELECT gID, gName FROM groups ";
try { $UserGroupList = $db->fetchAll($queryAllUserGroup); } catch (Exception $e){echo $e->getMessage();}
ksort($UserGroupList); //
return $UserGroupList;
}
}
?>