slidewall не работает

Я установил slidewall на Ubuntu 16.04, используя ppa: fioan89 / slidewall.

Я также установил python-appindicator, python-notify, python-notify2, python-webkit. Но slidewall не работает.

Вот ошибки, которые я получил:

$ /opt/extras.ubuntu.com/slidewall/bin/slidewall
/opt/extras.ubuntu.com/slidewall/slidewall/__init__.py:23: PyGIWarning: Gtk was imported without specifying a version first. Use gi.require_version('Gtk', '3.0') before import to ensure that the right version gets loaded.
  from gi.repository import Gtk # pylint: disable=E0611
/opt/extras.ubuntu.com/slidewall/slidewall_lib/Builder.py:20: PyGIWarning: AppIndicator3 was imported without specifying a version first. Use gi.require_version('AppIndicator3', '0.1') before import to ensure that the right version gets loaded.
  from gi.repository import AppIndicator3 as appindicator
/opt/extras.ubuntu.com/slidewall/slidewall_engine/NotifyEngine.py:16: PyGIWarning: Notify was imported without specifying a version first. Use gi.require_version('Notify', '0.7') before import to ensure that the right version gets loaded.
  from gi.repository import Notify
Please make sure you have installed python image module

Как я могу это решить?