mysql_fetch_array(): not a valid result?

[Jam-ez]

Error:

Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in H:\wamp\www\randomn\index.php on line 32

Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in H:\wamp\www\randomn\index.php on line 33

index.php

<?php

session_start();
include("config.php");

if ($_GET['login'])
{
    switch ($_GET['login'])
    {
        case '1':
        
        echo("Welcome to something not worth the warm welcome.
             
             <form action='?login=2' method='post'>
             <strong>Username</strong>: <input type='text' name='username' size='20' />
             <br /><br />
             <strong>Password</strong>: <input type='text' name='password' size='20' />");
        
        break;
        
        case '2':
        
        $username = $_POST['username'];
        $password = $_POST['password'];
        $password = md5($password);
            
        if ($username == "" || $password == "")
        {
            die("You did not enter a username and/or password.");
        }
        
        list($user) = mysql_fetch_array(mysql_query("SELECT `username` FROM `staff` WHERE username='$username'"));
        list($pass) = mysql_fetch_array(mysql_query("SELECT `password` FROM `staff` WHERE password='$password'"));
            
        if ($username == "$user" && $password == "$pass")
        {
            $sql = mysql_query("SELECT * FROM `staff` WHERE username='$user' AND password='$pass'");
        
            if (mysql_num_rows($sql) != 1)
            {
                die("Error...");
            }
                
            $result = mysql_fetch_array($sql);
                
            $_SESSION['user'] = $result['username'];
            $_SESSION['level'] = $result['level'];
            $_SESSION['ip'] = $_SERVER['REMOT_ADDR'];
            
            header("location: home.php");
                
            }
        
        break;
    }
}
else if (!$_GET['login'])
{
    header("location: ?login=1");
}
else
{
    die("Error.");
}

?>

config.php (table is commented out because I've already added it)

<?php

$host = "localhost";
$user = "root";
$pass = "";
$data = "hab";

$connect = mysql_connect($host, $user, $pass);

if (!$connect)
{
    echo("Error connecting to database.");
}

mysql_select_db($data);

/*
    mysql_query("CREATE TABLE `users` (
                                   `id` int(255) NOT NULL auto_increment,
                                   `username` varchar(500) collate latin1_general_ci NOT NULL,
                                   `password` varchar(500) collate latin1_general_ci NOT NULL,
                                   `level` varchar(500) collate latin1_general_ci NOT NULL,
                                   PRIMARY KEY  (`id`)
                                   ) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci AUTO_INCREMENT=44 ;
                                    ") or exit("Couldn't create users table.");
                                    
    echo("Users table created."); */
    
?>

Any ideas why its giving me this error? I'm testing on localhost, wampserver.

[Jam-ez]

Fixed, was an error in the mysql table.

[Doritos]

Next time if you want to figure out what happened, use mysql_error();

mysql_query("blabla") or die(mysql_error());