Creating symlink (/home/moritz/projects/toga_venv/lib/python3.4/site-packages/gi & /home/moritz/projects/toga_venv/lib/python3.4/site-packages/pygtkcompat) to system GTK+ libraries...
(toga-demo:13991): GLib-GIO-CRITICAL **: g_application_set_application_id: assertion 'application_id == NULL || g_application_id_is_valid (application_id)' failed
Traceback (most recent call last):
File "/home/moritz/projects/toga_venv/lib/python3.4/site-packages/toga_gtk/widgets/icon.py", line 20, in __impl
return self._impl_cache[size]
KeyError: 32
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/moritz/projects/toga_venv/lib/python3.4/site-packages/toga_gtk/app.py", line 139, in _startup
self.startup()
File "/home/moritz/projects/toga_venv/lib/python3.4/site-packages/toga_demo/app.py", line 55, in startup
self.main_window.toolbar = [cmd1, toga.SEPARATOR, cmd2]
File "/home/moritz/projects/toga_venv/lib/python3.4/site-packages/toga/interface/window.py", line 127, in toolbar
self._set_toolbar(items)
File "/home/moritz/projects/toga_venv/lib/python3.4/site-packages/toga_gtk/window.py", line 42, in _set_toolbar
item_impl.set_icon_widget(toolbar_item.icon._impl_32)
File "/home/moritz/projects/toga_venv/lib/python3.4/site-packages/toga_gtk/widgets/icon.py", line 28, in <lambda>
_impl_32 = property(lambda self: self.__impl(32))
File "/home/moritz/projects/toga_venv/lib/python3.4/site-packages/toga_gtk/widgets/icon.py", line 23, in __impl
GdkPixbuf.Pixbuf.new_from_file(self._filename).scale_simple(size, size, GdkPixbuf.InterpType.BILINEAR)
GLib.Error: g-file-error-quark: Datei »/home/moritz/projects/toga_venv/lib/python3.4/site-packages/resources/tiberius.icns« konnte nicht geöffnet werden: Datei oder Verzeichnis nicht gefunden (4)
I believe this problem has been addressed by pybee/toga#122 - if you install toga-demo from a github checkout and you still get this problem, please reopen this ticket.