export to excel vb.net office 2010 - vb.net

Question

I have a vb.net project, want to export to excel (2010) in English from axmshflexgrid. But I have always an exception
Ancien format ou bibliothèque de type non valide
and an empty excel file with this code.
Private Sub cmd_export_excel_Click(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles cmd_export_excel.Click
On Error GoTo ErrorHandler
Dim iRow As Short
Dim iCol As Short
Dim objExcl As Microsoft.Office.Interop.Excel.Application
Dim objWk As Microsoft.Office.Interop.Excel.Workbook
Dim objSht As Microsoft.Office.Interop.Excel.Worksheet
Dim iHead As Short
Dim vHead As Object
objExcl = New Microsoft.Office.Interop.Excel.Application
objExcl.Visible = True
objExcl.UserControl = True
Dim oldCI As System.Globalization.CultureInfo = _
System.Threading.Thread.CurrentThread.CurrentCulture
System.Threading.Thread.CurrentThread.CurrentCulture = _
New System.Globalization.CultureInfo("en-US")
objWk = objExcl.Workbooks.Add
System.Threading.Thread.CurrentThread.CurrentCulture = oldCI
objSht = objWk.Sheets(1)
vHead = Split(g.FormatString, "|")
For iHead = 1 To UBound(vHead)
If Len(Trim(vHead(iHead))) > 0 Then objSht.Cells._Default(1, iHead) = vHead(iHead)
Next
System.Windows.Forms.Cursor.Current = System.Windows.Forms.Cursors.WaitCursor
For iRow = 0 To g.Rows - 1
For iCol = 0 To g.get_Cols() - 1
g.Row = iRow
g.Col = iCol
If g.Text <> "" Then
objSht.Range(NumCol2Lattre(iCol + 1) & "" & iRow + 2 & ":" & NumCol2Lattre(iCol + 1) & "" & iRow + 2 & "").Select()
objExcl.ActiveCell.Value = CStr(g.Text)
End If
Next iCol
Next iRow
objExcl.Application.Visible = True
System.Windows.Forms.Cursor.Current = System.Windows.Forms.Cursors.Default
objSht = Nothing
objWk = Nothing
objExcl = Nothing
Exit Sub
ErrorHandler:
objSht = Nothing
objWk = Nothing
objExcl = Nothing
MsgBox("Error In expotation task & " & Err.Description, MsgBoxStyle.Information)
Err.Clear()
End Sub

Answer 1

Do you have multiple versions installed?
Whats the version of you interop assemblies?
Compare the version with the created excel instance (objExcl.Version).
It looks like you have a version conflict.
You may have to re-install office2010 in this case(helps most of the time).