遇到通知未定义的索引

Question

我已经创建了这个脚本以插入我的数据库但总是有问题注意：未定义的索引：请让我知道为什么我有这个错误。

谢谢

<?php
 ob_start();
  include("db.php");
  if(isset($_POST['send'])!="")
  {
   $Service_Number=mysql_real_escape_string($_POST['Service_Number']);
       $rundate=mysql_real_escape_string($_POST['rundate']);
       $Bytes_In=mysql_real_escape_string($_POST['Bytes_In']);
       $Bytes_Out=mysql_real_escape_string($_POST['Bytes_Out']);
       $Average_Mbps_Upload=mysql_real_escape_string($_POST['Average_Mbps_Upload']);
       $Average_Mbps_Download=mysql_real_escape_string($_POST['Average_Mbps_Download']);
       $Average_Excess_Mbps=mysql_real_escape_string($_POST['Average_Excess_Mbps']);
       $update=mysql_query("INSERT INTO form_element_copy(Service_Number,rundate,Bytes_In,Bytes_Out,Average_Mbps_Upload,Average_Mbps_Download,Average_Excess_Mbps)VALUES
                                      ('$Service_Number','$rundate','$Bytes_In','$Bytes_Out','$Average_Mbps_Upload','$Average_Mbps_Download','$Average_Excess_Mbps')");

  if($update)
  {
      $msg="Successfully Updated!!";
      echo "<script type='text/javascript'>alert('$msg');</script>";

  }
  else
  {
     $errormsg="Something went wrong, Try again";
      echo "<script type='text/javascript'>alert('$errormsg');</script>";
  }
  }
 ob_end_flush();
?>