Failed to get value of the "Approval Status" column from the "Moderation Status" field type control

 1.Disable >>>>>>>List Settings >Version Settings> Content Approval Option...
2.After run powershell.If you run powershell script May be powershell script wont work....

Failed to get value of the "Approval Status" column from the "Moderation Status" field type control

Column Name: _ModerationStatus
Type :ModStat

$site = Get-SPSite "http://raghupc/"
$web = $site.OpenWeb("test/blog")
$list = $web.Lists["Posts"]
$items = $list.GetItems()

foreach ($item in $items)
{
write-host $item["Title"] $item["_ModerationStatus"]
write-host $item["ID"]
#$item["_ModerationStatus"] =0


    $item.Update()
}
$list.Update();
$web.Update();
$web.Dispose();
$site.Dispose();

<Field ID="{fdc3b2ed-5bf2-4835-a4bc-b7d1a6396a61}" 
       ReadOnly="FALSE" 
       Type="ModStat" 
       Name="_ModerationStatus" 
       StaticName="_ModerationStatus"
       DisplayName="Approval Status" 
       Hidden="FALSE" 
       CanToggleHidden="TRUE" 
       FromBaseType="TRUE"
      Required="TRUE" 
       SourceID="http://schemas.microsoft.com/sharepoint/v3">
  <CHOICES>
    <CHOICE>0;#Approved</CHOICE>
    <CHOICE>1;#Rejected</CHOICE>
    <CHOICE>2;#Pending</CHOICE>
    <CHOICE>3;#Draft</CHOICE>
    <CHOICE>4;#Scheduled</CHOICE>
  </CHOICES>
  <Default>2</Default>
</Field>