Visual Studio 2012 Error: Could not determine the dependencies of the COM reference "WordClientPkgLib"

I have received following error while trying to do replace a style set in word document. This will replace the styles in multiple document, currently i am building in visual studio 2012. kindly help me on this.

Error: Warning 1 Could not determine the dependencies of the COM reference "WordClientPkgLib". Error loading type library/DLL. (Exception from HRESULT: 0x80029C4A (TYPE_E_CANTLOADLIBRARY)) doc replacing

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
            Dim word_app As Microsoft.Office.Interop.Word.Application
            Dim word_doc As Microsoft.Office.Interop.Word.Document

            word_app = CreateObject("Word.Application")
            word_app.Visible = True

            Dim path As String = Me.TextBox1.Text

            Dim dir As New DirectoryInfo(path)

            Dim comnothing As Object
            comnothing = New Runtime.InteropServices.UnknownWrapper(Nothing)
            word_app = comnothing
            word_doc = comnothing
            For Each f As FileInfo In dir.GetFiles("*.docx")
                word_doc = word_app.Documents.Open(path & "\" & f.Name)
                word_doc.ApplyQuickStyleSet("Transcript_v4")
                word_app.Selection.WholeStory()
                word_app.Selection.Style = word_doc.Styles("Normal Continuing")
                word_app.Selection.HomeKey()
                word_app.Selection.Style = word_doc.Styles("Normal Initial")
                word_doc.Save()
                word_doc.Close()

                'MsgBox(f.Name)                        
            Next f

            MsgBox("Completed processing the files...")
            word_app.Quit()
        End Sub