I have error 3 try to open any file in my application!

[iozk_Live]

I'm trying to open files the issue is that the path or root directory
is not found
here some of code

if self.dlg.ShowModal() == wx.ID_OK:
self.filename = self.dlg.GetFilename()
self.dirname = self.dlg.GetDirectory()

path = open(os.path.join(self.dirname, self.filename))
self.file = editor.EditorPanel(self.mainntbk, -1)
self.file.LoadFile(path.read())
self.mainntbk.AddPage(self.file, ""+self.filename)
self.dlg.Destroy()