$ sonata 
/nix/store/b1f3r3g9lpmn591fpk40syrh4m80y971-sonata-1.7b1/lib/python3.7/site-packages/sonata/launcher.py:159: 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, Gdk
Traceback (most recent call last):
  File "/nix/store/b1f3r3g9lpmn591fpk40syrh4m80y971-sonata-1.7b1/bin/..sonata-wrapped-wrapped", line 9, in <module>
    sys.exit(run())
  File "/nix/store/b1f3r3g9lpmn591fpk40syrh4m80y971-sonata-1.7b1/lib/python3.7/site-packages/sonata/launcher.py", line 186, in run
    from sonata import main
  File "/nix/store/b1f3r3g9lpmn591fpk40syrh4m80y971-sonata-1.7b1/lib/python3.7/site-packages/sonata/main.py", line 38, in <module>
    import pkg_resources
ModuleNotFoundError: No module named 'pkg_resources'