Unable to cast COM object of type 'Microsoft.Office.Interop.Word.ApplicationClass'

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Visual-Studio

DLL

Office-Interop

Hello,

I am trying to find and replace tags on the word Document which loaded on windows form.to use the word.Range i declared

`Dim wd As Object = New Word.Document

Dim wa As Object = New Word.Application

wd = wordControl.ActiveDocument

 wa = wd.Application

Dim HeaderFooter As Word.Range          'Line1

Dim Header As Word.HeaderFooter         'Line2

//Line1 and Line 2's variable are noting after execution

HeaderFooter = wa.ActiveDocument.Range



For Each HeaderFooter In wa.ActiveDocument.StoryRanges     'this line throws exception

 With HeaderFooter.Find

  .Format = False

  .Replacement.Highlight = 100

  .Replacement.Font.Bold = True

  .Text = "<<Client Name>>"

  .Replacement.Text = "Mr. Client"

  .Execute(Replace:=Word.WdReplace.wdReplaceAll, Forward:=True, Wrap:=Word.WdFindWrap.wdFindContinue)

 End With`

Exception:

Unable to cast COM object of type 'Microsoft.Office.Interop.Word.ApplicationClass' to interface type 'Microsoft.Office.Interop.Word._Application'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{00020970-0000-0000-C000-000000000046}' failed due to the following error: could not be found. (Exception from HRESULT: 0x80030002 (STG_E_FILENOTFOUND)).


for that I am Using
- Visual Studio 2005 professional edition
- MS Office 2003 professional edition

when I am trying to create a word or excel object the object shows all the properties as attached in the Image.but during the declaration it did not gave any exception:

I am using following dll and library as a reference:

- Interop.office.dll

- Interop.Excel.dll

- Interop.Word.dll

- Microsoft office 11.0 object Library

- Microsoft Excel 11.0 object Library

- Microsoft Word 11.0 object Library


This codes working fine in many combination of windows and MS Office.but give problem in some combination.


Regards,

Vaibhav