==============================================
KeepNote 0.7.8: Thu Jul  2 11:43:47 2015
enabling extension 'keepnote'
enabling extension 'backup_tar'
enabling extension 'new_file'
enabling extension 'editor_insert_date'
enabling extension 'command_basics'
enabling extension 'export_html'
enabling extension 'python_prompt'
enabling extension 'notebook_http'
Traceback (most recent call last):
  File "/usr/bin/keepnote", line 437, in <module>
    main(sys.argv)
  File "/usr/bin/keepnote", line 423, in main
    start_gui(argv, options, args, cmd_exec)
  File "/usr/bin/keepnote", line 273, in start_gui
    need_gui = execute_command(app, argv)
  File "/usr/bin/keepnote", line 368, in execute_command
    win.open_notebook(path, open_here=False)
  File "/usr/lib/python2.7/dist-packages/keepnote/gui/main_window.py", line 866, in open_notebook
    self._restore_windows(notebook, open_here=open_here)
  File "/usr/lib/python2.7/dist-packages/keepnote/gui/main_window.py", line 801, in _restore_windows
    self.set_notebook(notebook)
  File "/usr/lib/python2.7/dist-packages/keepnote/gui/main_window.py", line 897, in set_notebook
    self.viewer.set_notebook(notebook)
  File "/usr/lib/python2.7/dist-packages/keepnote/gui/tabbed_viewer.py", line 352, in set_notebook
    viewer.set_notebook(notebook)
  File "/usr/lib/python2.7/dist-packages/keepnote/gui/three_pane_viewer.py", line 212, in set_notebook
    self.listview.set_notebook(notebook)
  File "/usr/lib/python2.7/dist-packages/keepnote/gui/listview.py", line 122, in set_notebook
    self.setup_columns()
  File "/usr/lib/python2.7/dist-packages/keepnote/gui/listview.py", line 230, in setup_columns
    self.set_expander_column(self.get_column(0))
TypeError: Gtk.TreeView.set_expander_column() argument 1 must be gtk.TreeViewColumn, not None