Help me :D

Hei versuche gerade Regipage zu machen aber es kommt überall diese Fhlermeldung !

Warning: mysql_fetch_object(): supplied argument is not a valid MySQL result resource in C:\xampp\htdocs\player_online.php on line 5

Notice: Trying to get property of non-object in C:\xampp\htdocs\player_online.php on line 5

poste mal den Inhalt deiner player_online.php

<?php
require_once("./inc/config.inc.php");
mysql_select_db("player");
$exe = mysql_query("SELECT COUNT(*) as count FROM player WHERE DATE_SUB(NOW(), INTERVAL 5 MINUTE) < last_play;");
$player_online = mysql_fetch_object($exe)->count;

echo "$player_online Spieler Online"
?>