gan ad masalah nie saat login muncul error
1.
Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in....
2.Warning: mysql_num_rows() expects parameter 1 to be resource, boolean given in....

coding:
<?php
include ("config/koneksi.php");
include ("config/library.php");
$pass = md5($_POST['password']);

$login = mysql_query("SELECT * FROM user WHERE id_user='$_POST[username]' AND sesi='$pass

$found = mysql_num_rows($login); //error

$r = mysql_fetch_array($login); //error

// Apabila username dan password ditemukan
if ($r){
session_start();
session_register("username");
session_register("sesi");
session_register("role");

$_SESSION[username] = $r[id_user];
$_SESSION[sesi] = $r[sesi];
$_SESSION[role]= $r[role];
header ('location:home.php';
}

ad yg tau solusi ny?