foreach giver fejle

Hej :)
Jeg har fået lavet et script som henter data fra mysql. har rettet i et eksisterene script.

Men jeg får følende fejl:
Warning: mysql_fetch_assoc(): 3 is not a valid MySQL result resource in /home/www/30stm.dk/v2/test.php on line 68


Mit script er:

<?php require_once('../Connections/loginserver.php'); ?>
<?php
if (!function_exists("GetSQLValueString")) {
function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "")
{
  $theValue = get_magic_quotes_gpc() ? stripslashes($theValue) : $theValue;

  $theValue = function_exists("mysql_real_escape_string") ? mysql_real_escape_string($theValue) : mysql_escape_string($theValue);

  switch ($theType) {
    case "text":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;   
    case "long":
    case "int":
      $theValue = ($theValue != "") ? intval($theValue) : "NULL";
      break;
    case "double":
      $theValue = ($theValue != "") ? "'" . doubleval($theValue) . "'" : "NULL";
      break;
    case "date":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;
    case "defined":
      $theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue;
      break;
  }
  return $theValue;
}
}

  $colname_users = $_GET['testid'];
mysql_select_db($database_loginserver, $loginserver);
$query_users = sprintf("SELECT * FROM `30stm_info` WHERE username LIKE %s ORDER BY username ASC", GetSQLValueString($colname_users . "%", "text"));
$users = mysql_query($query_users, $loginserver) or die(mysql_error());
$row_users = mysql_fetch_assoc($users);
$totalRows_users = mysql_num_rows($users);
?>
<?php
mysql_free_result($users);

    header ("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); // Date in the past
    header ("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT"); // always modified
    header ("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
    header ("Pragma: no-cache"); // HTTP/1.0
   
   
   
    if (isset($_REQUEST['json']))
    {
        header("Content-Type: application/json");
   
        echo "{\"results\": [";
        for ($i=0;$i<count($aResults);$i++)
        {
        echo "{\"id\": \"".$aResults[$i]['id']."\", \"value\": \"".$row_users['username']."}";
        }
        echo "]}";
    }
    else
    {
        header("Content-Type: text/xml");

        echo "<?xml version=\"1.0\" encoding=\"utf-8\" ?><results>";
        $i = 1;
        do {
        echo "<rs id=\"".$i++."\" value=\"".$row_users['username']."\">".$row_users['username']."</rs>";
        } while ($row_users = mysql_fetch_assoc($users));
        echo "</results>";
    }
?>


håber i kan hjælpe mig.