can not import joystick

[daliel]

python 3.6.9
Ubuntu 18.04
kivy 2.0.0
kivy-garden 0.1.5

joystick installed by command:
garden install joystick

try import with code:
from kivy.garden.joystick import Joystick
error:

Traceback (most recent call last):
  File "joystick_.py", line 4, in <module>
    from kivy.garden.joystick import Joystick
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 656, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 626, in _load_backward_compatible
  File "/usr/local/lib/python3.6/dist-packages/kivy/garden/__init__.py", line 180, in load_module
    return self._load_module(fullname, moddir)
  File "/usr/local/lib/python3.6/dist-packages/kivy/garden/__init__.py", line 184, in _load_module
    ('', '', imp.PKG_DIRECTORY))
  File "/usr/lib/python3.6/imp.py", line 245, in load_module
    return load_package(name, filename)
  File "/usr/lib/python3.6/imp.py", line 217, in load_package
    return _load(spec)
  File "/home/daliel/coding/coding/kivy/libs/garden/garden.joystick/__init__.py", line 1, in <module>
    from .joystick import Joystick
  File "/home/daliel/coding/coding/kivy/libs/garden/garden.joystick/joystick/__init__.py", line 8, in <module>
    Builder.load_file("joystick.kv")
  File "/usr/local/lib/python3.6/dist-packages/kivy/lang/builder.py", line 306, in load_file
    return self.load_string(data, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/kivy/lang/builder.py", line 373, in load_string
    parser = Parser(content=string, filename=fn)
  File "/usr/local/lib/python3.6/dist-packages/kivy/lang/parser.py", line 402, in __init__
    self.parse(content)
  File "/usr/local/lib/python3.6/dist-packages/kivy/lang/parser.py", line 508, in parse
    self.execute_directives()
  File "/usr/local/lib/python3.6/dist-packages/kivy/lang/parser.py", line 477, in execute_directives
    mod = getattr(mod, part)
AttributeError: module 'kivy.garden' has no attribute 'joystick'

try with another code:
from kivy_garden.joystick import Joystick
error:

Traceback (most recent call last):
   File "joystick_.py", line 5, in <module>
     from kivy_garden.joystick import Joystick
 ModuleNotFoundError: No module named 'kivy_garden.joystick'

But if i import graph all ok:

from kivy_garden.graph import Graph
from kivy.garden.graph import Graph

How I can import joystick