[vba] Excel VBA Run Time Error '424' object required

Private Sub CommandButton1_Click()

    Workbooks("Textfile_Receiving").Sheets("menu").Range("g1").Value = PROV.Text
    Workbooks("Textfile_Receiving").Sheets("menu").Range("g2").Value = MUN.Text
    Workbooks("Textfile_Receiving").Sheets("menu").Range("g3").Value = CAT.Text
    Workbooks("Textfile_Receiving").Sheets("menu").Range("g4").Value = Label5.Caption

    Me.Hide

    Run "filename"

End Sub

Private Sub MUN_Change()
    Dim r As Integer
    r = 2

    While Range("m" & CStr(r)).Value <> ""
        If Range("m" & CStr(r)).Value = MUN.Text Then
        Label5.Caption = Range("n" & CStr(r)).Value
        End If
        r = r + 1
    Wend

End Sub

Private Sub PROV_Change()
    If PROV.Text = "LAGUNA" Then
        MUN.Text = ""
        MUN.RowSource = "Menu!M26:M56"
    ElseIf PROV.Text = "CAVITE" Then
        MUN.Text = ""
        MUN.RowSource = "Menu!M2:M25"
    ElseIf PROV.Text = "QUEZON" Then
        MUN.Text = ""
        MUN.RowSource = "Menu!M57:M97"
    End If
End Sub