Error al asignar valores a los campos de un formulario de Word .docx

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Solucionado

Código vb.net:

Imports Microsoft.Office.Interop
 
Public Class Form1
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim oWrd2 As Word.Application
        oWrd2 = New Word.Application()
        Dim odoc2 As Word.Document
        oWrd2 = New Word.Application()
        oWrd2.Visible = True
        odoc2 = oWrd2.Documents.Open("C:\doc.docx")
        
        Try
            odoc2.Unprotect("***")
            odoc2.Bookmarks.Item("codProy").Select()
            marcador_Temp = odoc2.Bookmarks.Add("MarcadorTemporal")
            marcador_Temp.Range.Text = "001"
        Catch ex As Exception
            MsgBox(ex.Message)
        Finally
            odoc2.Close()
            oWrd2 = Nothing
        End Try
    End Sub
End Class