ขอความช่วยเหลือหน่อยคะโค้ดerror ช่วยแก้โค้ดให้หน่อยคะ

<?php
  session_start();
  include("connect.php");
  $db = "scsticker";
  $result = mysql_select_db($db);
  if(!$result){
  die('Could not find database called login: '. mysql_error());
 }
   
  $strSQL = "SELECT username_employee, password_employee FROM employee ";
  $objQuery = mysql_query($strSQL);
  $objResult = mysql_fetch_array($objQuery);
  if(!$objResult)
  {
      echo "Username and Password Incorrect!";
  }
  else
  {
      $_SESSION["username_employee"] = $objResult["username"];
      $_SESSION["password_employee"] = $objResult["password"];

      session_write_close();
      
      if($objResult["username_employee"] == "username")
      {
        header("location:index.php");
      }
      else
      {
        header("location:indexs.html");
      }
  }
  mysql_close();
?>