Slidewall doesn't start

[GKV]

After installing slidewall from ppa:fioan89/slidewall on Ubuntu 16.04.1 LTS(fully updated), slidewall won't start up at all.

When run from a terminal:
$ slidewall
slidewall: command not found

When run:
$ /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

Thanks.

p.s.: "slidewall: command not found" is a translation from "slidewall: команда не найдена", because I use russian version of Ubuntu, and I don't know how it looks like in english version.