ช่วยด้วยครับ Warning: mysql_fetch_array(): supplied argument is not a valid MySQ

[jo23748]

<?
include("config.php");
@session_start();
session_register("ses_Pur_Pro_id");
session_register("ses_Pur_Pro_name");
session_register("ses_Pur_Pro_stro");
session_register("ses_Pur_Pro_unit");
session_register("ses_Pur_Pro_unit_wait");
session_register("ses_Pur_Pro_price");
session_register("ses_Pur_amount");
session_register("ses_Pur_total_per_unit");
session_register("ses_Pur_vat");
session_register("ses_Pur_price_vat");
session_register("ses_Pur_price_total");
session_register("ses_vat");
session_register("purchase_total");
session_register("purchase_vat");
session_register("purchase_net");
if(!session_is_registered("ses_Pur_Pro_id")){
$ses_Pur_Pro_id=array();
}
if(isset($_POST[submit])){
$sql_config="SELECT * FROM config WHERE con_id=1";
$result_config=mysql_query($sql_config);
$data_config=mysql_fetch_array($result_config);
for($i=0;$i<count($inChk);$i++){
$chk_array=in_array($inChk[$i],$ses_Pur_Pro_id);
if($chk_array==false && isset($inChk[$i])){
$sql="SELECT * FROM books WHERE book_id=$inChk[$i]";
$result=mysql_query($sql);
$data=mysql_fetch_array($result); // ตอนรันผิดตรงบรรทัดนี้ครับ
$ses_Pur_Pro_id[]=$data[book_id];
$ses_Pur_Pro_name[]=$data[book_name];
$ses_Pur_Pro_stro[]=$data[Int_num];
$ses_Pur_Pro_unit[]=$data[Point_order];
$ses_Pur_Pro_unit_wait[]=$data[Int_order];
$ses_Pur_Pro_price[]=$data[Book_price];
$ses_Pur_amount[]=1;
$ses_vat[]=$data_config[con_vat];
$ses_Pur_vat[]=$data[Pro_cost]*$data_config[con_vat];
}//¨ºif Check array
}//¨ºfor
}//¨ºif submit
echo "<meta http-equiv=refresh content=0;url=book_order.php />";
?>




ตอนรันจะขึ้นแบบนี้ครับ ช่วยให้ท่านผู้เชี่ยวชาญแก้ปัญหาให้หน่อยนะครับ

Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in C:\AppServ\www\PROJECT\Order_chkbook.php on line 31

[mindphp]

ใช้ php เวอร์ชั่นไหนหรอครับ