I just updated from 42.3 to 15.0. Autokey-gtk, which was working fine on 42.3, now brings this output on starting (usng xfce):

Traceback (most recent call last):
File "/usr/bin/autokey-gtk", line 11, in <module>
load_entry_point('autokey==0.95.2', 'console_scripts', 'autokey-gtk')()
File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 572, in load_entry_point
return get_distribution(dist).load_entry_point(group, name)
File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2755, in load_entry_point
return ep.load()
File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2408, in load
return self.resolve()
File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2414, in resolve
module = __import__(self.module_name, fromlist=['__name__'], level=0)
File "/usr/lib/python3.6/site-packages/autokey/gtkui/__main__.py", line 4, in <module>
from autokey.gtkapp import Application
File "/usr/lib/python3.6/site-packages/autokey/gtkapp.py", line 45, in <module>
from autokey.gtkui.notifier import get_notifier
File "/usr/lib/python3.6/site-packages/autokey/gtkui/notifier.py", line 23, in <module>
gi.require_version('AppIndicator3', '0.1')
File "/usr/lib64/python3.6/site-packages/gi/__init__.py", line 130, in require_version
raise ValueError('Namespace %s not available' % namespace)
ValueError: Namespace AppIndicator3 not available

What am I missing?